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Sounds can be a bit harder to judge, I think unless it's obvious screeching you have to get to know your ham to figure that out, if you can!
I forgot to mention freezing, another sign of fear or being startled, too, probably a bit obvious but it can be a bit disconcerting when you first see it as they appear totally oblivious to everything, if they do this I always find it best to just talk to them quietly & slowly move may hand close to them until they snap out of it.