Diseaster Bunny

Diseaster Bunnies come from the small eggs laid by the Lepus, and therefore look like a miniature version of it. They also appear instead of Bunnies during easter, at any time of the day, and so long as the world has been in play for a couple of in-game days. It acts exactly like a Corrupt Bunny. Although they come from the Lepus, they do nothing intentionally to help the Lepus when it is under attack. They can be quite annoying for new players, due to their high attack, health, speed and jumping ability, and the fact that they can spawn anywhere on the surface at any time.

Trivia
The first part of its name is a play on the words "disaster" and "Easter" (or perhaps "disease" and "Easter", or both).

If you are playing on an outdated version and your clock is at the time the diseaster bunnies spawn, then they will be corrupt bunnies instead.