Fall off what? Different animals evolved different anatomies to meet the requirements of their environment – humans (tailless primates) would certainly be less apt to swing from branch to branch than say gibbons or rhesus monkeys because humans spent ~2MM years evolving to walk upright on hard ground and the other two didn’t.
I’m no expert, but I think most animals with no tails or really short tails tend to have really stocky, stable legs, and do not tend to be fast runners or agile jumpers that put themselves in situations where they often lose their balance. Bears, tortoises, badgers, etc do not have the same sort of lifestyle as cats, monkeys, rats etc
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