One leg, two ....
legs
one ear, two...
ears
one fish, two...
fish
one hippo, two...
hippos
one monster, two...
monsters
One mouth, two...
mouths
one tiger, two...
tigers
one tail, two...
tails
one crocodile, two...
crocodiles
One mouse, two...
mice
One tooth, two....
teeth
one nose, two...
noses
One cat, two...
Cats
one snake, two...
snakes
one foot, two...
feet
one head, two...
heads