Monoceraptor
A great monster who invaded Tyrannia along with an army of similar dinosaur-like Neopets during The Tyrannian Invasion. He was the 'boss' challenger of the war, coming after seven inital waves of invaders.
After the ransacking of Tyrannia, he earned himself a place in the Gallery of Evil (11th May 2001), but was removed at some unrecorded later point for unknown reasons.
It was implied at the end of the war that the Monoceraptor was the 'puppet' of some greater evil, although it is open thread as to who this could have been. There is some speculation that it could have been Dr Sloth, and some think it was just a TNT joke about them 'using' the Tyrannian war to test the Battledome system.
Monoceraptors Claw
The Monoceraptors Claw (as it is an item name, there is no possesive apostrophe) is one of the most powerful and valued battledome weapons in the game. It was, for a time, only available for purchase from the Hidden Tower before it was retired from there, and at present no more suppliers have surfaced. The only way of buying one of these awe-inspiring weapons is by purchasing it off another player.
Interesting enough, the nail of the Monoceraptors Claw is blood red and blade-thing, confliciting with the images of the dinosaur.