A Stud is a male llama who is used to breed females. He can also be called a herdsire.
I think he is called a hembra.
gelding
A human adult male is called a man.
A male llama and a female llama.
An adult male is called a Boomer.
Male carabou are called bulls.
An adult male Zebra is called a stallion.
A male bear is called a boar.
A young girl horse is called a filly, and a young male is called a colt. An adult female is called a mare, and an un-castrated adult male is called a stallion. A castrated adult male is called a gelding.
I heard that it is is sometimes called a macho.
Adult birds are called cocks (male) and hens (female).
A baby llama is called a cria.