Chewing is a natural behavior for rats. Their incisors never stop growing so they must chew to wear them down.

I've found that rats who get everything they need from their enclosure, whether it is a tub or an aquarium or a wire cage, will rarely attempt to chew their way out. Are you meeting all their needs? Do they ALWAYS have food, water, hide boxes and chewable toys available? If not, they will try to look elsewhere. If they can't find a hole to escape from they'll make one. Every time I had chewing occur in plastic containers was because the food dish or water bottle was empty.

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