Here's a Black-capped Chickadee with an Avian Keratin Disorder-caused beak that seems to match the thread, taken at Grandview Cemetery in Fort Collins on 24 October 2011. I saw this bird off and on for about two weeks before it disappeared. I once saw it catch what I think was an assassin bug (Zelus sp.). Apparently the inability of such birds to preen properly is as much a liability as how it might impair food acquisition. It is easy to see how preening/thermoregulation is critical at times like this current Polar Vortex event.
David Leatherman
Fort Collins
From: cobirds@googlegroups.com <cobirds@googlegroups.com> on behalf of Thomas Heinrich <teheinrich@gmail.com>
Sent: Monday, February 15, 2021 2:49 PM
To: Colorado Birds <cobirds@googlegroups.com>
Subject: [cobirds] Another bird with a deformed beak, Denver Cty, 12/31/2020
Sent: Monday, February 15, 2021 2:49 PM
To: Colorado Birds <cobirds@googlegroups.com>
Subject: [cobirds] Another bird with a deformed beak, Denver Cty, 12/31/2020
Here's a photo of a Woodhouse's Scrub Jay taken at 11th and Knox in Denver county on December 31, 2020.
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