"If it doesn't have a tail it's not a monkey, even if it has a monkey-kind-of shape. It if doesn't have a tail it's not a monkey; if it doesn't have a tail it's not a monkey: it's an ape."

With the one exception being Curious George.

Yeah but his tail was amputated, my neighbour had a cat without tail, bitten off by a dog or something, it's not that uncommon.

Perhaps the 'curiousness' of George was not his personality trait, but rather the curious affliction of his missing tail.