The Birds of North America catalogue says:
> As with the Downy Woodpecker, breast and other white markings of Hairy
Woodpecker are subject to discoloration due to soot from air pollution,
forest fires, tannins from tree surfaces, and other environmental sources.
They reference "Jackson, J. A. (1970c). Character variation in the Hairy
Woodpecker *Dendrocopos villosus*. Phd Thesis, Univ. of Kansas, Lawrence"
for this, but I was unable to find a copy of this thesis online.
I was wondering about rust coloration recently, too; I saw a Hairy the
other day with reddish tips to the outer retrices, and I hadn't noticed
this before. https://ebird.org/vt/view/checklist/S53053396
On Wed, Feb 27, 2019 at 4:40 PM kencox5 <[log in to unmask]> wrote:
> I have noticed the same pigmentation on the underside of Hairy Woodpeckers
> visiting the feeders here but interestingly not on Downies. Am interested
> in following the response thread that hopefully will follow.Sent from my
> Verizon, Samsung Galaxy smartphone
> -------- Original message --------From: Tom Berriman <
> [log in to unmask]> Date: 2/27/19 4:25 PM (GMT-05:00) To:
> [log in to unmask] Subject: [VTBIRD] Hairy Woodpecker color Interesting
> coloring to a female Hairy Woodpecker at Damon's Crossing thisafternoon.
> Don't know if it was caused by rust colored tree it was digginginto or is
> pigmentation. Noticed it under tail, chest, cheeks and base ofbill.
> https://ebird.org/vt/view/checklist/S53198354 Tom Berriman
Richard | @richlitt <https://twitter.com/richlitt> | burntfen.com