Pink Wither

The Pink Wither or Friendly Wither was a recurring April Fools' mob present in both Java Edition 2.0 and 15w14a.

Behaviour
In 2.0 it could be summoned by placing a potted rose atop pink wool. The newly spawned mob has one head.

The pink wither would follow players holding sugar, and feeding it said sugar would cause it to grow more heads, up to a maximum of three.

It would apply an effect similar to bone meal upon surrounding blocks, whose range would be increased by its head count. It would also heal surrounding mobs.

The mob is considered undead and classified as a hostile mob

In 15w14a, it replaces the wither, firing skulls with a bone meal effect.

ID
ID was WitherHug in 2.0, not sure about 15w14a.