I struggled with this letter, I thought of a couple, including Upcher's Warbler and Ural Owl, but on checking images I couldn't in fairness say they contained white - only pale greys and off whites!U=Ultramarine Flycatcher
Any particular reason you don't like the letters W, X or Y??Z - Zebra Finch
Half asleep reply while birding Jamaica!Any particular reason you don't like the letters W, X or Y??
;-)