What is a group of mules called?
A mule is a hybrid equine between a male donkey and a female horse. Generally, the foreparts (front part and the head) look like a donkey and the hindparts (back part and the tail) look like a horse.

A group of mules is called a pack of mules, a span of mules, a barren of mules, or a rake of mules.

Photographer: Martina Nicolls
Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM