Which animal has the smallest tail?

It's impossible to say definitively which animal has the *smallest* tail because "smallest" can be interpreted in different ways. Here's why:

* Size: Tails come in all shapes and sizes, and "smallest" could refer to length, width, volume, or even weight.

* Evolution: Some animals, like snakes, have tails that are virtually non-existent or are so small they're practically fused with the body.

* Purpose: Many animals have tails that are important for balance, movement, communication, or other functions. Some animals may have smaller tails because they don't need them for these purposes.

Examples of animals with small or vestigial tails:

* Snakes: Many snake species have tails that are very short or even absent.

* Whales: While some whales have prominent tails, others like the beluga whale have very small, barely noticeable tails.

* Humans: We have a tiny, vestigial tailbone (coccyx) that is a remnant of our evolutionary past.

Conclusion: There isn't a single animal with the "smallest" tail. It depends on how you define "small" and the specific animal you're comparing.