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Hamsters are mammals which belong to the rodent family having large incisor teeth that are continually growing necessitating gnawing to prevent the teeth from overgrowing.
Rabbits are mammals which belong to the Lagomorph order that also includes hares and pikas
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Gerbils are mammals which belong to the rodent family having large incisor teeth that are continually growing necessitating gnawing to prevent the teeth from overgrowing.

Mice are mammals which belong to the rodent family having large incisor teeth that are continually growing necessitating gnawing to prevent the teeth from overgrowing.
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