The calf's tail is like a whip, which can drive away mosquitoes in summer. Tail refers to the part located at the tail end of the animal's back, especially the appendage which is flexible and obviously separated from the trunk, and is roughly equivalent to the sacrum and coccyx of mammals and birds.

Generally speaking, the tail is a unique feature of vertebrates. However, some invertebrates also have tail-like structures, such as the tail or bifurcation of scorpions.

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In fact, invertebrates have no real tails. People often say that the tails of invertebrates are actually the stomachs of these animals or some attached organs, such as scorpions and dragonflies, which are actually their narrow stomachs because their anus is open at the end of their bodies.

Some fly larvae look like long tails, but they are actually their breathing tubes. Shrimp tails, similar to fish, actually evolved from several pairs of feet.