Some of the frogs lay their eggs in foam nests. They will lay their eggs in crevices, on the surface of water, or on the forest floors. For tadpoles that are laid on the forest floors will remain there until they become frogs. They will not eat anything. In the genus "Elutherodactylus", the eggs will automatically become small frogs. They will not go through the tadpole stage. Leptodactylids can be found in fossil records. One specimen, was found preserved and is thought to be 37 million years old.