Bell Mare: generally older mares wearing a bell, used as leaders in pack trains or put in a remuda to locate where horses are grazing at night.

Bell: To trim an animal's tail into a distinctive bell shaped pattern, often used on mules. The pattern is used for identification, for instance to show where a horse or mule should be in a pack string.

Broom-tail: A class of range horses that are considered not worth much.

Bangtail: Mustang mare (not necessarily limited to mares). In older days, uncombed tails were a sign of an unbroken horse.

Bronco: An animal that has never been broken to saddle or...