What animals do

Cats mew when they’re hungry, purr when they’re happy and caterwaul when they’re on the roof at midnight.
Dogs bark. They also growl when they’re angry. Lions roar.
Sheep and goats bleat, horses neigh and pigs grunt. Cows moo.
Frogs croak and ducks quack. Cocks crow, hens cluck and owls hoot.
N.B. All these verbs are regular verbs.

Movements animals make

Birds fly and fish swim.                                    
Butterflies flutter.
Kangaroos hop.
Snakes slither.
Horses trot and gallop (galloping is faster than trotting).
Lambs skip in the spring.
N.B. Fly (flew, flown) and swim (swam, swum) are the only irregular verbs here.

Babies animals have

Cats have kittens and dogs have puppies. Horses have foals. Sheep have lambs.
Cows have calves. Pigs have piglets. Bears, wolves and lions have cubs.
Ducks have ducklings. Hens lay eggs from which chickens hatch.
Tadpoles turn into frogs. Caterpillars turn into butterflies.

People and animals

People are often compared to animals. The following adjectives can be used about people. A more formal translation is given.

catty or bitchy: malicious-tongued ratty: bad-tempered
mousy: dull, uninteresting, shy, quiet dogged: stubborn
sheepish: awkwardly self-conscious cocky: arrogant