Chippunks and Stunks definitely have a thing going, but Fuzzles, Rats and Bats are probably no more related than their equivalent Earth creatures are.
Interns and Vykkers have been hinted at as being similar species, a possible interpretation of a concept sketch in the art book, but I don't think that's exactly what it meant.
When we first saw Clakkers, there were strong suspicions that they were an evolutionary offshot of Mudokons, as it seems both evolved from birds.
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