Common animal feature that humans lack

The answer to this crossword question is “Tail“. A tail is a common animal feature that humans lack. A tail is a body part that extends from the back end of many animals, and it is used for balance, communication, and mobility. Tails can be found on mammals, reptiles, and other types of animals, and they can vary in shape, size, and function depending on the species. Humans do not have tails because their ancestors evolved to walk upright on two legs, and a tail would have been unnecessary for balance or mobility.