Is the shivering significant? If you’ve eliminated the shivering by upping the temp a bit, then I’d say he was likely a bit chilly. As for sleeping puffed up, maybe that’s just him. My Peanut is a naturally ‘fluffy’ bird. He’s always puffed up and the vet even asked me if it was normal for him as she was concerned he could be sick. Alkira likes to fluff himself up when he’s sleeping but not any other time. As for JoJo, she never fluffs up. So, my point is, watch him and get to know his normal. If he’s active, eating well and poops look normal, then I’d say that maybe he likes to sleep fluffed up. Maybe when the weather warms up, that will change. You’re keeping him out of drafts I’m guessing?
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