Interactive: Frog life cycle, from egg to adult

Updated

24/06/26
Read time

3 minutes

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Frog life cycle

Frogs undergo one of nature’s most extraordinary transformations: a four-stage journey from egg to tadpole to metamorph to adult that reshapes an aquatic larva into a terrestrial vertebrate able to breathe air, leap on land, and call for a mate.

Understanding this cycle is essential for frog conservation. Changes in timing or success at any stage can signal broader environmental pressures, making frogs important indicators of ecosystem health.

Explore the frog life cycle interactive

Explore each stage of the frog life cycle below using the AM interactive. Click a stage to learn what's happening biologically, and discover some surprising facts along the way.

Life stages of frogs

Female frogs of most species lay hundreds to thousands of eggs in water, usually attached to aquatic plants or floating in clusters. Fertilisation occurs externally in almost all frog species, with the male releasing sperm over the eggs as they're laid. The embryo develops inside the egg, feeding on its yolk until ready to hatch.

Did you know?

A single frog can lay up to 20,000 eggs at once
Only a small percentage of eggs survive to adulthood
Some frog species have parental care, making nests for their eggs from gravel or mud, or guarding them from potential predators

Most tadpoles hatch from eggs as fully aquatic larvae. They breathe through gills and use a long tail to swim. Tadpole diets vary widely among species. Many graze on algae and biofilms, but others are detritivores (animals that eat dead plants and animals or tiny bits of waste), omnivores (animals that eat both plants and other animals), or even begin hunting other animals from a very early development stage. During this stage, dramatic internal changes are already beginning in preparation for metamorphosis.

Did you know?

They can detect vibrations through a lateral line system
Some species remain tadpoles for multiple years
While this is the typical life cycle of a frog, some frog species skip the free-living tadpole stage entirely, developing into small frogs inside eggs.

Metamorphosis transforms the Tadpole into a frog. A transitional stage with both a tail and developing legs. Hind legs emerge first, followed by front legs. The gills are replaced by lungs, and the digestive system typically shifts from plant-based to carnivorous. The tail is gradually reabsorbed as a source of energy. Metamorphs begin venturing onto land while still retaining their tail stub.

Did you know?

The tail is reabsorbed, not shed. It is used as energy
This stage is one of the most dramatic transformations in the animal kingdom
Tadpoles can speed up metamorphosis if ponds dry or delay metamorphosis

Adult frogs are typically at least partially terrestrial, although some species remain almost entirely aquatic. Frogs breathe through lungs and moist skin, which also allows gas exchange. Adults of most frog species are carnivores, feeding largely on insects, small invertebrates using their sticky tongues. When the breeding season arrives, adults of most species return to water, males call to attract mates, and the cycle begins again.