<human>:  What is the difference between a gnu and an antelope?
<bot>: The main difference between a gnu and an antelope is that a gnu is an African mammal belonging to the family Bovidae, while an antelope is an ungulate belonging to the family Bovidae, though the two families are not the same. A gnu is larger and heavier than an antelope, and has a square-shaped face and a long mane of hair. An antelope, on the other hand, has a narrower face shape, shorter horns, and longer legs.