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Anonymous
It's not a size difference issue, it's a genetic issue. Mice and rats are two completely different species. Yes, some different species can breed and have offspring, such as lions/tigers, leopard cats/domestic cats, and dogs/coyotes. However, rats and mice can not. It is just not genetically possible. Even two very closely related rat species, the brown Norway rat and the black rat, can not produce viable offspring.
However, when they are raised together, rats and mice can become friends. They can even fuck. They just can't produce babies.
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