My hamster is about 5 months old and she won’t stop biting the bars at the opening of her cage. She’s now got a little red mark on one side of her face because of it. Her cage is huge and she has plenty of toys, things to chew and treats too. I don’t want her to hurt herself!

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    From my experience, this means that they want a larger cage. If it's a syrian hamster, make sure that it has at least 450 sq. inches of floor space. (more is better).
    – Jacob B
    Dec 11 '20 at 1:23
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    Also, do you know which breed your hamster is? Syrians have slightly different needs than campbells.
    – C.Koca
    Dec 11 '20 at 5:29
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    Welcome to Pets.SE! Please take the tour and have a look at the help center, especially What does it mean if a question is closed. How big is her "huge" cage actually? These tiny animals have an insane instinct to run around, which means that a cage that seems huge for their body size can still be too small for their instincts.
    – Elmy
    Dec 11 '20 at 6:03
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    Additional to the linked answered question: If it biting only the "door", maybe it is smart enough to know "sometimes it is open!" I notice this behavior in my rabbits sometimes. Dec 11 '20 at 6:25