SEXUALLY DIMORPHIC BODY PLUMAGE IN JUVENILE CROSSBILLS

PIM EDELAAR; RON E. PHILLIPS; PETER KNOPS

doi:10.1676/04-082.1

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PIM EDELAAR,^{*,**,***,****,*****} RON E. PHILLIPS,^****** PETER KNOPS^*******

^*Dept. of Biology, New Mexico State Univ., Las Cruces, NM 88003, USA
^**Dept. of Zoology, Univ. of British Columbia, Vancouver, BC V6T 1Z4, Canada
^***Dept. of Theoretical Biology, Univ. of Groningen, 9750 AA, Haren, The Netherlands
^****Current address: Dept. of Ecology and Evolutionary Biology, Univ. of Arizona, Tucson, AZ 85721, USA
^*****Corresponding author; w.m.c.edelaar@umail.leidenuniv.nl
^******Yetholm, St. Catherine's Place, Elgin, Moray, Scotland, United Kingdom
^*******Molsteeg 37, 6369 GL Simpelveld, The Netherlands

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.

Citation Download Citation

PIM EDELAAR, RON E. PHILLIPS, and PETER KNOPS "SEXUALLY DIMORPHIC BODY PLUMAGE IN JUVENILE CROSSBILLS," The Wilson Bulletin 117(4), 390-393, (1 December 2005). https://doi.org/10.1676/04-082.1

Received: 6 August 2004; Accepted: 1 July 2005; Published: 1 December 2005

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