A male donkey is a Jack and a female donkey is a Jenny.
A male wombat is a Jack and a female wombat is a Jill.
A male kangaroo is a buck and a female kangaroo is a doe.
A male sheep is a ram or a whether (if castrated) and a female sheep is a ewe.
A male horse is a stallion or a gelding (if castrated) and a female horse is a mare.
A male cow is a bull or a steer (if castrated) and a female cow is a heifer.
A male dog is a dog and a female dog is a bitch.
And I can testify that they don’t call them a bitch for nothing! Of all the animals on the farm, Millie and Baby cause more trouble than everyone else combined!