My hamster jumped?

I went to get my hamster out to just have him sit on my hand to get used to me a bit more and he went in fine then jumped and landed on my floor, i was sat on the floor so he was about 40cm off the floor, if that. When he landed he seemed okay, he landed on all 4s and just walked around like nothing happened.... show more I went to get my hamster out to just have him sit on my hand to get used to me a bit more and he went in fine then jumped and landed on my floor, i was sat on the floor so he was about 40cm off the floor, if that. When he landed he seemed okay, he landed on all 4s and just walked around like nothing happened. He's also been climbing his cage since I've got him and been falling / jumping off. Is there anything I should worry about? He seems to be consistently biting the cage where he knows the door is, is that a sign?
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