Animals Thing

Male => Female => Young

Ant - ant - grub
Bear - she-bear - cub
Boar - sow - piglet
Billy-goat - nanny-goat - kid
Buck(deer) - doe - fawn
Buck(hare) - doe - leveret
Buck(rabbit) - doe - bunny
Bull(cattle) - cow - calf
Bull(elephant) - cow - calf
Bull(whale/seal) - cow - calf
Butterfly - butterfly - caterpillar
Cock - hen - chick
Cock(pigeon) - hen - squab
Dog - bitch - dog,puppy
Drake - duck - duckling
Drone(bee) - bee - grub
Eagle - eagle - eaglet
Fly - fly - maggot
Fox - vixen - cub
Frog - frog - tadpole
Gander - goose - gosling
Hawk - bowess - bowet
Kangaroo/boomer - kangaroo/flier - joey
Leopard - leopardess - cub
Lion - lioness - cub
Moth - moth - caterpillar
Owl - owl - owlet
Peacock - peahen -peachick
Ram(sheep) - ewe - lamb
Stallion - mare - foal
Tiger - tigress - cub
Toad - toad -tadpole
Tomcat - tabby - kitten
Trout(fish) - trout - fry
Wasp - wasp - grub
Wolf - she-wolf - cub