Monocerous

A vicious bull-like monster who loves to eat JubJubs, although in its (now removed) Gallery of Evil entry, JubJubs were described as the only creatures immune to it's roar. The Monocerous' roar paralyises its foes.

Although it's origin has been known since the beginning of Neopets, It's actually debatable if this monster is even considered part of Neopets anymore, as it has been taken out of the Gallery of Evil, along with all related items.

The name may be based on monoceros, a horse constallation.

Random Event goes...

The Monocerous roars 'Once I ate 16 Jub Jubs in a week!'