* Humans

* Dogs

* Cats

* Horses

* Cows

* Pigs

* Monkeys

* Elephants

* Bears

However, some animals have sclera that are not white:

* Birds: Many birds have sclera that are yellow, orange, or even red.

* Reptiles: Reptiles often have sclera that are yellow, brown, or even black.

* Fish: Fish generally have sclera that are black or dark grey.

The color of the sclera is determined by the amount of melanin in the tissue. While white sclera is common in mammals, it's not universal.