Do birds get fat in fall?
I'm talking about the ones that stay in north during winter, not migratory birds. I've noticed that birds like sparrows or tits (yes yes i know funny name) look more rotund in fall, but is that actually fatness or just them fluffing up?
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Mostly puffing up their feathers. On warm days they are suddenly smaller again.
I believe this is scientifically referred to as temporary borbitude.