Saturday, October 08, 2011

when is a duck Ferruginous?

on the patch today -- is this a first-winter or eclipse drake Ferruginous Duck or are there sneaky hybrid genes in there? is the bill pattern within the range of variation for a pure bird? aythya ducks!

Identification of Ferruginous Duck and its status in Britain and Ireland K E Vinicombe
British Birds Volume 93 Number 1 January 2000 pages 4-21

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