Re: [CVBirds] Yellow-capped Acorn Woodpecker in Bidwell Park?
Denise and David Hamilton
I just looked up Acorn Woodpecker on Birds of North America online and found this:
Nonmelanic leucism, or partial albinism, occurs at a frequency of about 0.1% (WDK). More rarely, individuals in California have been recorded with golden yellow, rather than red, crowns (WDK).
Koenig, W. D., P. B. Stacey, M. T. Stanback, and R. L. Mumme (1995). Acorn Woodpecker (Melanerpes formicivorus), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.194
It is really quite pretty with the yellow cap!
From: tomarne26@... [central_valley_birds]
Sent: Saturday, October 27, 2018 11:06 AM
Subject: [CVBirds] Yellow-capped Acorn Woodpecker in Bidwell Park?
I can't remember where I saw it, but I was following up on an online post that identified an Acorn Woodpecker in Upper Bidwell Park that had a yellow cap. I found it this morning and wondered how rare this variation of Acorn Woodpecker is. Any thoughts?
Pictures attached to my eBird post: https://ebird.org/view/checklist/S49493343