Birds steal fur. I mean, we were pretty sure, but scientists have now properly observed and catalogued the behavior.
And now we know who's fur they prefer: Predators.
And they do it more in higher latitudes. The scientists keep coming up with all kinds of reasons why they prefer wolf fur over horse fur.
My thought:
Because predators spend more time lazing around, they have thicker fur. So maybe it's just about keeping their eggs warmer.
The animals don't seem to mind. Maybe the birds prefer fur that's about to shed anyway and it's like a good grooming...
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