Sloth. An animal that is so slow that greenish mold grows on it
Squirrel. A tree-dwelling rodent with a long bushy tail and strong hind legs, that's feeds chiefly on nuts and seeds.
a caterpillar
Cat, and a cow
Bull
Cat, cheetah, caribou
'Hare' is a four letter word for an animal, that starts with the letter 'H'.
The Gnu. They are also known as Wildebeest.
Newt is a four letter animal. It is a small amphibian.
Lamb, lion, llama and lynx are animals. They have 4 legs.
fish
An animal that walks on four legs is called a quadruped.
A yak
Mouse