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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ValiantDust
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18•18 hours ago
Mostly puffing up their feathers. On warm days they are suddenly smaller again.
- bacon_saber
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  fedilink
  11•14 hours ago
  I believe this is scientifically referred to as temporary borbitude.
  - @Smoogs
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    0•12 hours ago
    deleted by creator

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