When Does a Crossbill's Bill Cross?
If you keep making that face, it’s gonna stick that way!
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Show Notes
A young crossbill starts life with a wedge-shaped beak. As it grows up and starts to feed itself by removing conifer seeds from their tough packaging, the tips of its bill begin to grow rapidly — and then they cross. By the time the bird is a month and a half old, the tips of its bill become fully crossed.
More info and transcript at BirdNote.org.
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