Birds of Indian Subcontinent

Sexually Dimorphic Body Plumage in Juvenile Crossbills

Publication Type:Journal Article
Year of Publication:2005
Authors:EDELAAR, PIM, Phillips, RE, Knops, P
Journal:The Wilson Bulletin
Date Published:2005
ISBN Number:00435643
Keywords:Fringillidae, Loxia, Loxia curvirostra, Loxia scotica, Panuridae, Panurus, Panurus biarmicus
Abstract:Sexual dimorphism in color and pattern of contour feathers is rare in juvenile songbirds. We describe how captive-bred juvenile males of Scottish Crossbill (Loxia scotica) and nominate Red Crossbill (L. curvirostra curvirostra) can be differentiated from females prior to prebasic molt by an unstreaked patch on the males' upper breast. There may be a functional relationship between sexual dimorphism and the formation of pair bonds or breeding while the birds are still in juvenile plumage. Sexually dimorphic Red Crossbills and Bearded Tits (Panurus biarmicus) are known to form pair bonds, and even breed successfully, while still in juvenile plumage.
Short Title:The Wilson Bulletin
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith