Bernd Heinrich’s new book “White Feathers” — a review
10,000 Birds
FEBRUARY 6, 2020
His first surmise seems like a good one – that the feathers are meant to hide the eggs from other female swallows seeking to parasitize the nest, by disrupting the parasite’s timing (if eggs are present, the parasite would know that the nesting mother is ready to incubate – that is, incubate not only her own eggs, but the parasite’s, as well).
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