Four-legged mimic

The four-legged mimic is a native to the planet Vergon 6 which has the form of a horse and is able to copy the colour and facial structure of any creature it sees, having tranformed into Leela and Nibbler. It is one of the Vergonian species the Planet Express crew needed to save from extinction in the year 3000. Unfortunately, Nibbler ate it along with the other animals.