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Title

A new subspecies of Gurney’s Hawk Buteo poecilochrous

AuthorsCabot, José ; Vries, Tjitte de
Issue Date2009
PublisherWitherby & Co
CitationBull. B.O.C. , 129(3):149-164 (2009)
AbstractA new subspecies of Gurney’s Hawk Buteo poecilochrous is recognised for populations of the species from northern Peru and western Bolivia to north- west Argentina and northern Chile. Specimen analysis reveals that they differ in size and plumage from northernmost populations, in south Colombia to south Ecuador. The new subspecies is slightly smaller in body measurements and in definitive plumage has the grey-feathered areas darker and more slate-coloured than the nominate subspecies. Furthermore, pale- and dark-morph females possess a more extensive dorsal patch; the pale morph has white central underparts and finely barred or vermiculated sides, whilst in juveniles, in general, these areas are warm brown with rusty or cinnamon markings. In the nominate form, by contrast, the underparts are usually darker brown with creamy or whitish markings
Publisher version (URL)http://www.boc-online.org/bulletin-downloads.htm
URIhttp://hdl.handle.net/10261/50116
ISSN0007-1595
Appears in Collections:(EBD) Artículos
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