Jul 17, 2023
Animals That Lay Eggs: More Than Just Birds
Egg-laying, or oviparity, is widespread in nature.
Birds
All birds lay eggs, from tiny hummingbirds to ostriches. Many build nests and incubate their eggs with body heat.
Reptiles
Most snakes, lizards, turtles and crocodiles lay eggs. Some snakes keep eggs inside the body and give birth to live young.
Amphibians and fish
Frogs lay jelly-like eggs in water, and many fish scatter eggs or guard nests. Sharks vary: some lay leathery egg cases known as “mermaid’s purses.”
Insects
Butterflies, bees and beetles lay eggs on specific plants or in nests.
Mammals that lay eggs
The platypus and echidnas, collectively called monotremes, are the only mammals that lay eggs. They feed their young with milk afterwards.
Why it matters
Different egg-laying strategies reflect adaptation to environment and offer clues to evolution.
This guide is for general information only and is not a substitute for advice from a qualified veterinarian. If your pet seems unwell, contact your vet.
