COMMENTS REQUESTED: I would appreciate any comments or suggestions on the following four draft PowerPoint presentations. They may be sent to me at raptours@earthlink.net. Thanks! Bill.
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Extreme tail variation in adult Harlan's Hawk. (PowerPoint presentation, November 2015) pdf
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Harlan's Hawks differ from Red-tailed Hawk. (PowerPoint presentation, February 2014) pdf
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Is Harlan's Hawk a subspecies of Red-tailed Hawk? Review of publications that advocate such -- and why their taxonomic justifications are not convincing. (PowerPoint presentation, May 2018) pdf
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Harlan's Hawks are & have been breeding within the Red-tailed Hawk range in western Canada. (PowerPoint presentation, January 2014) pdf
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PAPERS:
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Clark, W. S. 2018. Taxonomic status of Harlan’s Hawk Buteo jamaicensis harlani (Aves: Accipitriformes). Zootaxa 4425 (2): 223–242. https://doi.org/10.11646/zootaxa.4425.2.2
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Clark, W. S. 2018. The Alaska Red-tailed Hawk. Western Birds 49:126–135, 2018; doi 10.21199/WB49.2.3
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Clark, W.S. 2017. Group size of Harris's Hawks (Parabuteo unicinctus) in south Texas. Wilson Journal of Ornithology 129(2):364-368. pdf
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Clark, W.S. 2017. Response to Monroy-Ojeda et al. 2016. Wilson Journal of Ornithology 129(2):417-420. pdf
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Clark, W. S. and N. John Schmitt. 2017. Raptors of Mexico and Central America. Princeton U. Press, Princeton NJ.
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Clark, W.S., S.C. Galen, J.M. Hull, M.A. Mayo, and C.C. Witt. 2017. Contrasting molecular and morphological evidence for the identification of an anomalous Buteo: a cautionary tale for hybrid diagnosis. PeerJ 5:e2850: DOI 10.7717/peerj.2850 pdf
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Galindo, R., M. Gustafson, R. Rodriguez, and W.S. Clark. 2016 Gray Hawk fledged five juveniles in south Texas. Bulletin of the Texas Ornithological Society 49(1-2):86-87. pdf
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Clark, W.S. and P.H. Bloom. 2016. Plumages by sex of adult and basic III Rough-legged Hawks (Buteo lagopus). Wilson Journal of Ornithology 128(4):867-873. pdf
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Marsden, M., M. Miller, and W.S. Clark. 2016. Winter nesting of White-tailed Kite in south Texas. Bulletin of the Texas Ornithological Society 49(1/2):84-85 pdf
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Buij, R., W.S. Clark and D.G. Allan. 2016. First records of Red-necked Buzzard Buteo auguralis for southern Africa, with notes on identification of Buteo buzzards in the subregion. Bulletin of the African Bird Club 23(1):46-63. pdf
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Clark, W.S. & P.Pyle. 2015. Commentary: a recommendation for standardized age-class plumage terminology for raptors. Journal of Raptor Research 49(4):513-517. pdf
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Clark, W.S.. 2013. Catching eagles Indian style. pp. 334-337 in D.H. Ellis (ed.). Enter the realm of the Golden Eagle. Hancock House, Surrey, B.C. and Blaine, WA.
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Clark, W.S. 2012. The eagle genus Hieraaetus is distinct from Aquila, with comments on the name Ayres’ Eagle. Bulletin of the British Ornithologists’ Club 132:295-298. pdf
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Clark, W.S. 2012. Raptor banding in the Rio Grande Valley: Winter 2011-02012. Texas Birds Annual 8:6-12. pdf
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Duffy, K.E., W.S. Clark, and J.R. Hough. 2012. Probable Hen Harrier (Circus cyaneus cyaneus) at Cape May, New Jersey. North American Birds 66:4-8. pdf
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Clark, W.S. 2011. (Review of) Hawks at a distance, by Jerry Liguori. Texas Birds Annual 7:61-62.
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Clark, W.S., C. McIntyre, O. Hatzofe, and E. Gorney. 2011. Booted Eagle Hieraaetus pennatus longevity record. Sandgrouse 33:181. pdf
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BOOK REVIEW Liguori, J. 2011. Hawks at a distance. Princeton University Press pdf
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Dénes, F.V., L.F. Silveira, S. Seipke, R. Thorstrom, W.S. Clark, and J.-M. Thiollay. 2011. The White-collared Kite (Leptodon forbesi Swann, 1922) and a review of the taxonomy of the Grey-headed Kite (Leptodon cayanensis Latham, 1790). Wilson Journal of Ornithology 123:323-331.
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Millsap, B..A., S.H. Seipke, and W.S. Clark. 2011. The Gray Hawk (Buteo nitidus) is two species. Condor 113:326-339. pdf
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Seipke, S.H., F.V. Dénes, F. Pellinger, R. Thorstrom, J.-M. Thiollay, L.F. Silveira, and W.S. Clark. 2011. Field identification of White-collared Kite Leptodon forbesi and similar-looking species in north-east Brazil. Neotropical Birding 8:29-39. pdf
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Clark, W.S. 2009. Extreme variation in the tails of adult Harlan's Hawks. Birding 41:30-36 + supplement. pdf
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Clark, W.S. 2009. Juvenile Forest Buzzard in Kgalagadi Transfrontier Park. Gabar 19:28-30. pdf
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Clark, W.S., M.A. Patten, and J.C. Wilson. 2009. Dark Sharp-shinned Hawk Accipiter striatus from California is melanistic. Bulletin of the British Ornithologists' Club 129:254-255. pdf
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Clark, W.S. 2008. Hybrid Bald Eagle x Steller's Sea-eagle from Vancouver Island, British Columbia. Birding 40:28-31. pdf
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Simmons, R.E., T. Hardaker, and W.S. Clark. 2008. Partial albino African Marsh Harrier at Langebaan, South Africa. Gabar 19:16-21. pdf
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Seipke, S.H., and W.S. Clark. 2008. [First documented record of the Short-tailed Hawk (Buteo brachyurus) in Santiago del Estero, Argentina. Revista Nuestras Aves 53:35. (In Spanish) pdf
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Bloom, P.H., W.S. Clark, and J.W. Kidd. 2007. Capture techniques. Pp. 193-219 in D.M. Bird and K.L. Bildstein (eds.), Raptor research and management techniques. Hancock House Publishers, Surrey, British Columbia.
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Clark, W.S. 2007. Raptor identification, ageing, and sexing. Pp. 47-56 in in D.M. Bird and K.L. Bildstein (eds.), Raptor research and management techniques. Hancock House Publishers, Surrey, British Columbia.
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Clark, W.S. 2007. Taxonomic status of the Forest Buzzard Buteo oreophilus trizonatus. Ostrich 78:99-102. pdf
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Clark, W.S. 2007. Taxonomic status and distribution of Mangrove Black Hawk Buteogallus (anthracinus) subtilis. Bulletin of the British Ornithologists' Club 127:110-117.
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Clark, W.S. 2007. Solitary Eagles: possible in Texas? Texas Birds Annual 3:16-18. pdf
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Clark, W.S. 2006. Interspecific communal winter night roost in South Texas. Journal of Raptor Research 40:177-178. pdf
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Clark, W.S., and P. Christy. 2006. First record of Oriental Honey Buzzard Pernis ptilorhynchus for Gabon and sub-Saharan Africa. Bulletin of the African Bird Club 13:207-210. pdf
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Clark, W.S., H.L. Jones, C.D. Benesh, and N.J. Schmitt. 2006. Field identification of the Solitary Eagle. Birding 38:66-74. pdf
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Clark, W.S., and N.J. Schmitt. 2006. Melanistic specimen of Black-chested Buzzard-eagle (Geranoaetus melanoleucus) with comments on the species' taxonomic position. Journal of Raptor Research 40:86-88. pdf
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Clark, W.S., and C.C. Witt. 2006. First known specimen of a hybrid Buteo: Swainson's Hawk (Buteo swainsoni) and Rough-legged Hawk (B. lagopus) from Louisiana. Wilson Bulletin 118:42-52. pdf
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Clark, W.S. 2005. Steppe Eagle is monotypic. Bulletin of the British Ornithologists' Club 125:149-153. pdf
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Clark, W.S., and P.H. Bloom. 2005. Plumages of Basic II and Basic III Rough-legged Hawks. Journal of Field Ornithology 76:83-89. pdf
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Clark, W.S., D. Fisher, B. Finch, B. de Bruijn, and I. Shani. 2005. Status of Beaudouin's Circaetus beaudouini and Short-toed Snake Eagles C. gallicus in Kenya. Bulletin of the African Bird Club 12:151-152. pdf
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Clark, W.S., M. Reid, and B.K. Wheeler. 2005. Four cases of hybridization in North American Buteos. Birding 37:256-263. pdf
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Clark, W.S. 2004. First dark-morph Hook-billed Kite fledged in the United States. North American Birds 58:170. pdf
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Clark, W.S. 2004. Is the Zone-tailed Hawk a mimic? Birding 36:494-498. pdf
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Clark, W.S. 2004. Immature plumages of the Eastern Imperial Eagles Aquila heliaca. Pp. 569-574 in R.D. Chancellor and B.-U. Meyburg (eds.), Raptors worldwide. World Working Group on Birds of Prey, Berlin. pdf
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Clark, W.S. 2004. Wave molt of the primaries of accipitrid raptors, and its use in ageing. Pp. 795-804 in R.D. Chancellor and B.-U. Meyburg (eds.), Raptors worldwide. World Working Group on Birds of Prey, Berlin. pdf
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Clark, W.S., and C. Barlow. 2004. Status of Short-toed and Beaudouin's Snake Eagles in The Gambia. Bulletin of the African Bird Club 11:25-27. pdf
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Clark, W.S. 2003. Specimen of rufous-morph Augur Buzzard Buteo augur in Zimbabwe. Bulletin of the African Bird Club 10:107-108. pdf
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Poh, L., and W.S. Clark. 2003. Adult male Oriental Honey Buzzards (race torquatus) have yellow eyes. Bulletin of the Oriental Bird Club 37:50-51. pdf
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Clark, W.S. 2002. Griffon Vulture is a species. Vulture News 46:24. pdf
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Clark, W.S. 2002. First nesting of a dark-morph Hook-billed Kite in the United States. North American Birds 56:260-262. pdf
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Clark, W.S., and D.R. Paulson. 2002. Specimen record of Short-toed Snake Eagle for Kenya is invalid. Bulletin of the British Ornithologists' Club 122:156-157. pdf
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Parry, S.J., W.S. Clark, and V. Prakash. 2002. On the taxonomic status of the Indian Spotted Eagle Aquila hastata. Ibis 144: 665-675. pdf
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Yosef, R., W.S. Clark, and S. Hoffman. 2002. An unusual Long-legged Buzzard Buteo rufinus at Eilat, Israel. Sandgrouse 24:60-63. pdf
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Bloom, P., and W.S. Clark. 2001. Molt and sequence of plumages of Golden Eagles, and a technique for in-hand ageing. North American Bird Bander 26:97-116. pdf
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Clark, W.S. 2001. First record of European Griffon Gyps fulvus for Kenya. Bulletin of the African Bird Club 8:59-60. pdf
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Clark, W.S. 2001. Ageing Bald Eagles. Birding 33:18-28. pdf
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Clark, W.S. 2001. Ageing eagles at hawk watches: what is possible and what is not. Pp. 143-148 in K.L. Bildstein and D. Klem (eds.), Hawkwatching in the Americas. Hawk Migration Association of North America, Wales, PA.
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Clark, W.S. 2001. Identification review: Crested Caracara in Basic I plumage. Birding 33:524-527. pdf
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Clark, W.S., and B.K. Wheeler. 2001. (Book) A field guide to hawks (of) North America. Revised ed. Peterson Field Guide Series no. 35. Houghton Mifflin, Boston, MA.
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Clark, W.S., and C. Edelstam. 2001. First record of Cassin's Hawk Eagle Spizaetus africanus for Kenya. Bulletin of the African Bird Club 8:138-139. pdf
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Rasmussen, P.C., W.S. Clark, J. Parry, and N.J. Schmitt. 2001. Field identification of "Long-billed Vultures" (Indian and Slender-billed Vultures). Bulletin of the Oriental Bird Club 34:24-29. pdf
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Yosef, R., A.J. Helbig, and W.S. Clark. 2001. An intrageneric Accipiter hybrid from Eilat, Israel. Sandgrouse 23:141-144. pdf
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Clark, W.S. 2000. Field identification of Beaudouin's Snake Eagle Circaetus beaudouini. Bulletin of the African Bird Club 7:13-17. pdf
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Clark, W.S., and R.A.G. Davies. 2000. Taxonomic problems in African diurnal raptors. Pp. 121-133 in R.D. Chancellor and B.-U. Meyburg (eds.), Raptors at risk. World Working Group on Birds of Prey, Berlin. pdf
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Clark, W.S., C. Schultz, and O. Allen. 2000. Conservation of migrating raptors through banding; results of over 30 years of the Cape May Point Raptor Banding Project. Pp. 617-625 in R.D. Chancellor and B.-U. Meyburg (eds.), Raptors at risk. World Working Group on Birds of Prey, Berlin, and Hancock House, London. pdf
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Clark, W.S. 1999. Plumage differences and taxonomic status of three similar Circaetus snake-eagles. Bulletin British Ornithologists' Club 119:56-59. pdf
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Clark, W.S. 1999. (Book) A field guide to the raptors of Europe, the Middle East, and North Africa. Oxford University Press, Oxford.
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Clark, W.S. 1999. Ayres's Hawk-Eagle Hieraaetus ayresi sightings in Cameroon. Bulletin of the African Bird Club 6:115-116. pdf
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Gorney, E., W.S. Clark, and Y. Yom-Tov. 1999. A test of condition-bias hypothesis yields different results for two species of sparrowhawks (Accipiter). Wilson Bulletin 111:181-187. pdf
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Clark, W.S. 1998. First North American record of a melanistic Osprey. Wilson Bulletin 110:289-290. pdf
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Clark, W.S. 1998. Little Sparrowhawk catches and eats a bat. Journal of African Raptor Biology 13:22-23. pdf
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Clark, W.S, and R. Clarke. 1998. Differences in tarsal length between adult female Montagu's and Pallid Harriers: an easy method to separate specimens. Bulletin British Ornithologists' Club 118:52-54. pdf
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Clark, W.S., and N.J. Schmitt. 1998. Ageing Egyptian Vultures. Alula 4:122-127. pdf
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Clark, W.S., and B.K. Wheeler. 1998. 'Dark-morph' Sharp-shinned Hawk reported from California is normal juvenile female of race perobscurus. Bulletin of the British Ornithologists' Club 118:191-193. pdf
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Clark, W.S., and R. Yosef. 1998. In-hand identification guide to Palearctic Raptors. International Birdwatching Center, Eilat, Israel.
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Clarke, R., V. Prakash, W.S. Clark, N. Ramesh, and D. Scott. 1998. World record count of roosting harriers Circus in Blackbuck National Park, Velavadar, Gujarat, north-west India. Forktail 14:70-71. pdf
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Corso, A., and W.S. Clark. 1998. Identification of Amur Falcon. Birding World 11:261-268. pdf
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Clark, W.S. 1997. Identification of perched Montagu's and Pallid Harriers. Birding World 10:267-269. pdf
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Clark, W.S. 1997. A dark morph for the African Marsh Harrier. Journal of African Raptor Biology 12:27-29. pdf
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Clark, W.S., and R. Yosef. 1997. Migrant Levant Sparrowhawks (Accipiter brevipes) at Eilat, Israel: measurements and timing. Journal of Raptor Research 31:317-320. pdf
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Clark, W.S. 1996. The validity of Archer's Buzzard as a species. Journal of African Raptor Biology 11:11-13. pdf
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Clark, W.S. 1996. Ageing Steppe Eagles. Birding World 9:269-274. pdf
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Clark, W.S. 1996. [Separation of Lesser Kestrel Falco naumanni from Kestrel F. tinnunculus (with remarks on American Kestrel F. sparverius)]in German with English summary. Limicola 10:57-78. pdf
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Clark, W.S. 1995. How fast is the fastest bird? Age-old speeds of Peregrine Falcons revised. Wildbird 9:42-43.
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Clark, W.S. 1995. Capture and banding of migrant raptors. Israel Journal of Zoology 41:237-242. pdf
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Clark, W.S. 1995. Specimen of Eurasian Sparrowhawk verified. Journal of African Raptor Biology 10:39.
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Clark, W.S. 1995. Sighting of Rufous-morph Booted Eagle in South Africa. Journal of African Raptor Biology 10:38.
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Clark, W.S., and H. Shirihai. 1995. Identification of Barbary Falcon. Birding World 8:336-343. pdf
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Clark, W.S., and B.K. Wheeler. 1995. The field identification of Common and Great Black Hawks in Mexico and Central America. Birding 27:33-37. pdf
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Wheeler, B.K., and W.S. Clark. 1995. (Book) A photographic guide to North American raptors. Academic Press, London.
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Clark, W.S. 1994. Elephanta--a great place to watch flying raptors. Hornbill 2:18-20. pdf
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Clark, W.S., and A.A. Khan. 1994. Sightings of two rare raptors, Lesser Spotted Eagle Aquila pomarina and Pied Harrier Circus melanoleucus, in Pakistan. Forktail 10: 173-175. pdf
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Clark, W.S. 1994. Species accounts for Asiatic raptors. In: del Hoyo, J., A. Elliot, and J. Sargatal (eds.), Handbook of the birds of the world, Vol. 2. Lynx Ed., Barcelona, Spain.
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Farquhar, C.C., W.S. Clark, R.G. Wright, and M. Cuello. 1994. First record of interspecific cartwheeling between large raptors: Buteo poecilochrous and Geranoaetus melanoleucus. Journal of Raptor Research 28:274-275. pdf
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Prakash, V., N.V. Prakash, and W.S. Clark 1994. Oriental Honey Buzzard, Pernis ptilorhynchus, a new species for the Andaman Islands. Forktail 9:157-158. pdf
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Clark, W.S., and B.M. Beehler. 1993. Another continental India record of Accipiter gularis. Journal of the Bombay Natural History Society 90:505-506. pdf
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Clark, W.S., and N.J. Schmitt. 1993. Red-headed Falcon pirates prey from Montagu's Harrier. Journal of Field Ornithology 64:244-245. pdf
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Clark, W.S., and N.J. Schmitt. 1993. Field identification of the Rufous-bellied Eagle Hieraaetus kienerii. Forkail 8:7-9. pdf
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Clark, W.S. 1992. On the etymology of the name bal-chatri. Journal of Raptor Research 26:196. pdf
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Clark, W.S. 1992. Dark-morph Montagu's Harrier. Dutch Birding 14:178-179. pdf
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Clark, W.S. 1992. The taxonomy of Steppe and Tawny Eagles, with criteria for separation of museum specimens and live eagles. Bulletin of the British Ornithologists' Club 112:150-157. pdf
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Clark, W.S. 1992. Raptor count at Beidaihe, China, Fall 1991. Hawk Migration Studies 17:14-16. pdf
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Clark, W.S., and R. Banks. 1992. The taxonomic status of the White-tailed Kite. Wilson Bulletin 104:571-579. pdf
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Clark, W.S., and N.J. Schmitt. 1992. Flight identification of Indian raptors with pale wing bars. Journal of Bombay Natual History Society 82:1-3. pdf
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Clark, W.S., and R. Parslow. 1991. A specimen record of the Shikra for Saudi Arabia. Sandgrouse 13:44-46.
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Clark, W.S. 1990. Spotted Eagle wtih rufous nape patch. British Birds 83:397-399. pdf
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Clark, W.S. 1990. Birding in Israel. Birding 22:48-50.
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Clark, W.S. 1990. Migration and movements. Pp. 152-163 in I. Newton and P. Olsen (eds.), Birds of prey. Facts on File, New York.
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Clark, W.S., and D. Forsman. 1990. The plumage of the subadult male marsh harrier. Dutch Birding 12:181-185. pdf
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Clark, W.S., R. Frumkin, and H. Shirihai. 1990. Field identification of the Sooty Falcon. British Birds 83:47-54. pdf
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Clark, W.S. 1989. The rufous morph of the Booted Eagle. Dutch Birding 11:57-60. pdf
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Clark, W.S., P.H. Bloom, and L.W. Oliphant. 1989. Aplomado Falcon steals preys from Little Blue Heron. Journal of Field Ornithology 60:380-381. pdf
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Clark, W.S., and B.K. Wheeler. 1989. Field identification of the White-tailed Hawk. Birding 21:190-195. pdf
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Clark, W.S., and B.K. Wheeler. 1989. Unusual roost site selection and staging behavior of Black-shouldered Kites. Journal of Raptor Research 23:116-117. pdf
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Clark,W.S., K. Duffy, E. Gorney, M. McGrady, and C. Schultz. 1988. Supernumerary primaries and rectrices in some Eurasian and North American raptors. Journal of Raptor Research 22: 53-58. pdf
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Clark, W.S., and Y. Leshem. 1988. Partial albino Lappetfaced Vulture in Kenya. Ostrich 59:44-45. pdf
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Frumkin, R., and W.S. Clark 1988. Is there a dark morph of the Sooty Falcon? Ibis 130:569-571. pdf
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Clark, W.S. 1987. The dark morph of the Marsh Harrier. British Birds 80:61-70. pdf
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Clark, W.S. and E. Gorney. 1987. Oil contaminationof raptors migrating along the Red Sea. Environmental Pollution 46:307-313 pdf
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Clark, W.S., and B.K. Wheeler. 1987. (Book) A field guide to hawks (of) North America. Peterson Field Guide Series no. 35. Houghton Mifflin, Boston, MA.
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Clark, W.S. 1986. Raptors. In P. Tucker (ed.), Bird identification guide. American Birding Association, Austin, TX.
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Clark, W.S. 1986. The migrating Sharp-shinned Hawks of Cape May Point, N.J. In M. Harwood (ed.), Proceedings of the Hawk Conference IV. Hawk Migration Association of North America, Carbondale, PA. 393 pp.
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Clark, W.S. 1986. What is Buteo ventralis? Birds of Prey Bulletin 3:115-118.
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Clark, W.S. 1986. The rufous morph of the Booted Eagle. Pp. 21-24 in International bird identification. Proceedings of the 4th International ID meeting, Eliat, Israel.
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Clark, W., K. Duffy, E. Gorney, M. McGrady, and C. Schultz. 1986. Raptor ringing at Eilat, Israel. Sandgrouse 7: 21-28. pdf
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Clark, W.S. 1985. Observations on behavior of Bald Eagles in summer. Pp. 180-190 in J.M. Gerrard and T. M. Ingram (eds.), The Bald Eagle in Canada: Proceedings of Bald Eagle Days 1983, Winnipeg, Manitoba, Canada.
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Clark, W.S. 1985. Migration of the Merlin along the coast of New Jersey. Raptor Research 19:85-94. pdf
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Clark, W.S. 1985. Methods used to study raptor migration. Pp. 229-236 in I. Newton and R. Chancellor (eds.), Conservation studies on birds of prey. International Council for Birds of Prey, Cambridge, UK.
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Clark, W.S. 1985. The migrating Sharp-shinned Hawk at Cape May Point: banding and recovery results. Pp. 137-148 in M. Harwood (ed.), Proceedings of Hawk Migration Conference IV. Hawk Migration Association of America, Rochester, NY.
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Bildstein, K.L., W.S. Clark, D.L. Evans, M. Field, L. Soucy, and E. Henckel. 1984. Sex and age differences in fall migration of Northern Harriers. Journal of Field Ornithology 55:145-150. pdf
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Clark, W.S. 1984. Agonistic "whirling" by Zone-tailed Hawks. Condor 86:488. pdf
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Clark, W.S. 1984. Field identification of accipiters in North America. Birding 16(6): 251-263. pdf
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Clark, W.S., and C.M. Anderson. 1984. First specimen record of the Broad-winged Hawk for Washington. Murrelet 65:93-94. pdf
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Heredia, B., and W.S. Clark. 1984. Kleptoparasitism by White-tailed Hawk (Buteo albicaudatus) on Black-shouldered Kites (Elanus leucurus) in southern Texas. Raptor Research 18:30-31. pdf
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LeFranc, M.L., and W.S. Clark. 1984. (Book) Working bibliography of the Golden Eagle and the genus Aquila. National Wildlife Federation Science and Technology Series no. 7. National Wildlife Foundation, Washington, D.C.
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Clark, W.S. 1983. The field identification of North American eagles. American Birds 37:822-826. pdf
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Clark, W.S. 1982. Turtles as a food source of nesting Bald Eagles in the Chesapeake Bay region. Journal of Field Ornithology 53:49-51. pdf
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Henny, C.J., and W.S. Clark 1982. Measurements of fall migrant Peregrine Falcons from Texas and New Jersey. Journal of Field Ornithology 53:326-332. pdf
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Clark, W.S. 1981. A modified dho-gaza trap for use at a raptor banding station. Journal of Wildlife Management 45:1043-1044. pdf
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Clark, W.S. 1981. Flight identification of common North American buteos. Continental Birdlife 2:129-143. pdf
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Lincer, J.L., W.S. Clark, and M.L. LeFranc. 1980. (Book) Working bibliography of the Bald Eagle. National Wildlife Federation Science and Technology Series no. 4. National Wildlife Federation, Washington, D.C.
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Clark, W.S., and M.E. Pramstaller. 1980. Field identification pamphlet for North American raptors. Raptor Information Center, National Wildlife Federation, Washington, D.C.
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Clark, W.S. 1978. Spring hawk movement at Sandy Hook, NJ -- 1977. New Jersey Audubon Society Occasional Paper No. 133. pdf
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Dunne, P.J., and W.S. Clark. 1977. Fall hawk movement at Cape May Point, N.J.-1976. New Jersey Audubon Society Occasional Paper no. 130.
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Clark, W.S. 1976. Cape May Point raptor banding station -- 1974 results. North American Bird Bander 1:5-13. pdf
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Clark, W.S. 1975. Analysis of data. Pp. 87-97 in M. Harwood (ed.), Proceedings of the North American Hawk Migration Conference. Hawk Migration Association of North America, Washington Depot, CT.
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Clark, W.S. 1974. Second record of the kestrel (Falco tinnunculus) for North America. Auk 91:172. pdf
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Clark, W.S. 1974. Cape May Point raptor banding station -- 1973 results. EBBA News 37:51-64.
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Clark, W.S. 1974. Occurrence of Swainson's Hawk substantiated in New Jersey. Wilson Bulletin 86:284-285. pdf
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Clark, W.S. 1973. Cape May Point raptor banding station-1972 results. EBBA News 36:150-165.
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Clark, W.S. 1972. Migration trapping of hawks (and owls) at Cape May, N.J. -- fifth year. EBBA News 35:121-131.
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Clark, W.S. 1970. Migration trapping of hawks (and owls) at Cape May, N.J. -- third year. EBBA News 35:181-190. pdf
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Clark, W.S. 1967. Partial albino Red-tailed Hawk. Maryland Birdlife 23:233.
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Clark, W.S. 1967. Modification of the bal-chatri trap for shrikes. Eastern Bird Bander News 30:147-149.
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