
One has a fluffy springy tail whilst the other has a slim tapering tail. Both had their bodies evolve over generations to suit the environment they live and their need to survive. The squirrel's furry tail may aid in the balance as it jumps from branch to branch. The tapered rat tail helps escape through tight fissures.

The bushy tail of the squirrel has its own added coincidental benefits. Being around flowering plants, the hairs on the tail aid in pollination.

Certain internal traits could have evolved over time as and when the environment demanded. Other incidental features, like the fuzzy tail, performs accidental purpose to the survival of other species. Who decides on this? Is there a higher power who plays the role of an intelligent designer who, for the kick of it, in a single brush decide to paint creations as He likes?
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