Nibbler is Leela's, cute pet that she rescued in season one that can devour creatures whole.  Plus he poops dark matter.  It is eventually revealed that Nibbler is actually a highly intelligent creature responsible for Fry's cryogenic freezing.

Futurama Quotes

Fry: Wow! You look happy. Is someone fired?
Hermes: Better!

We are the last remaining Cyclopses. Our planet is Cyclopia. This is the capital, Cyclops City. Stop me if I'm going too fast for you.

Alkazar