My cockateil sometimes seems to visibly shake, like a person does when they're cold. Is this normal? He doesn't show any symptoms of sickness, he has a good appetite and everything. But he shakes, only slightly. His cage isn't drafty, although it's by the door, so when people walk inside, wind comes towards him. But he shakes in rooms that there is definitely no drafts. Is this normal, or should we be concerned?
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