Any idea why this goldfinch is so puffed up?

We get a lot of goldfinches in the garden but I’ve never seen one looking like this. I thought it might be a juvenile but after googling now I’m worried it’s an adult with some disease. Here’s the inat link:


You should look on how it moves or doesn’t, is it closing eyes, etc. puffing up can be a sign of illness, but it can also be just a cold day for this bird.


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