Re: Why they do this?
Hamsters can hear sounds we humans can't at higher frequencies so it does look like they are getting startled by nothing in particular.
My current hamster did this a lot when I first got him to the point he would freeze for several minutes and seemed not to even notice me moving near him. As he settled in however he does this less and less, they must just get used to the background sounds around your house and realise they are not worth worrying about.
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