Toys are great additions to a rat cage. They can keep the rats more active, prevent fighting, reduce excessive weight gain, and can even help with mouth issues. Something as simple as a piece of 2x4 or a large bolt and nut. I prefer the piece of wood; I can just toss it during the cage change and give them a new one.
A rat's teeth are constantly growing, giving them something to chew on will prevent malocclusion.
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