Coloured tail-coverts in Anser × Branta goose hybrids despite all-white coverts in both parent species
Keywords:hybridisation, appearance, identification, Anatidae
I tested the hypothesis that barred or dusky tail-coverts are common in Anser × Branta goose hybrids despite all-white coverts in both parent species. Thirty-two photographically documented Anser × Branta goose hybrids in the author’s archive were assessed. Undertail-coverts were barred or more diffusely dusky in 23 out of the 30 individuals which could be fully evaluated. As to uppertail- coverts, there was some degree of barring or diffuse duskiness in 26 out of the 32 individuals. All-white upper- and undertail-coverts were seen in 1 out of 18 Greylag Goose × Greater Canada Goose hybrids and in 4 out of 5 Snow Goose hybrids; in one Snow Goose × Barnacle Goose hybrid and the only Greylag Goose × Lesser Canada Goose hybrid, barring was restricted to very few uppertail-coverts. In a domestic Swan Goose × Barnacle Goose, under-tail but not upper-tail coverts were coloured. The hypothesis that barred or dusky tail-coverts are common in Anser × Branta goose hybrids despite all-white coverts in both parent species is thus confirmed.
How to Cite
Copyright (c) 2010 C G Gustavsson
This work is licensed under a Creative Commons Attribution 4.0 International License.
The copyright of each contribution belongs to the author(s), but all contributions are published under a Creative Commons license, so that anyone is free to share and reuse the contribution as long as the copyright holder is attributed.