HI:
Some time ago someone on Tweeters wondered about birds eating mushrooms.
This short article is in the current issue of Northwestern Naturalist:
Fox Sparrow foraging on a king bolete mushroom. Anja M Schiller and
Keith W Larson. Page 252. The article reports mushrooms in the diets of 21
bird species.

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Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"