Tachycineta bicolor.
The problem is staying on. Remember how the male American Kestrel bunched up his claws so not to dig into his partner’s back? Here, the male bites some head feathers. Ouch!
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
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