JUST AN ILLUSION CHAFFINCH
Dec 16, 2021
2 minutes
HOW DOES A MALE CHAFFINCH TURN UP the colour intensity of its feathers from muted winter tones to bright, vibrant, in-your-face breeding garb? It’s a simple question to which the obvious answer might be to moult, especially given that feathers, like our hair, are dead material that once formed cannot be actively altered.
However, chaffinches are one of
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