A young butterfly is called a caterpillar. Caterpillars spend their lives eating before changing into butterflies. Learn more about this animal's life cycle in Butterflies.
Newly hatched salmon are called alevins. They have a yolk sac that gives them the food they need to grow. Learn more about this animal's life cycle in Salmon.
Did you know that birds sing songs in spring to find mates? Once a bird finds a mate, they build a nest together. Find out more in Birds, an All about spring book.