By my count, Colorado has hosted at least 19 species of warblers since November 1st. I probably missed one or two. The list jotted down includes (in no particular order):
prothonotary
black-and-white
northern parula
yellow-rumped
chestnut-sided
yellow-throated
pine
Nashville
Townsend's
common yellowthroat
black-throated blue
ovenbird
blackpoll (not sure if this one was ever confirmed)
yellow
Tennessee
MacGillivray's
Wilson's
orange-crowned
northern waterthrush
I think the key foods involved are aphids, midges and suet. Fruit on trees like juniper, Russian-olive, viburnums, mountain-ash and crabapple are probably also part of how these birds can cope with cold weather, fatten up and hopefully move on.
Any species I missed? How many will brighten our Christmas Counts?
Dave Leatherman
Fort Collins
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