Basic II and Basic III plumages of Rough-legged Hawks

William S. Clark; Peter H. Bloom

doi:10.1648/0273-8570-76.1.83

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William S. Clark,^1,* Peter H. Bloom²

¹a 2301 South Whitehouse Circle, Harlingen, Texas 78550 USA
²b Western Foundation of Vertebrate Zoology, 439 Calle San Pablo, Camarillo, California 93010 USA

^*Corresponding author. raptours@earthlink.net

Abstract

Adult Rough-legged Hawks (Buteo lagopus) are depicted and described in bird guides and handbooks as sexually dimorphic in plumage. We describe for the first time a Basic II plumage for this species, determined by incomplete flight feather molt, in which both sexes have the characters of adult females, and Basic III plumages that are essentially adult by sex but show pale primary patches on the upper wings.

Citation Download Citation

William S. Clark and Peter H. Bloom "Basic II and Basic III plumages of Rough-legged Hawks," Journal of Field Ornithology 76(1), 83-89, (1 January 2005). https://doi.org/10.1648/0273-8570-76.1.83

Received: 15 December 2003; Accepted: 1 June 2004; Published: 1 January 2005