Rhinoderma

Rhinoderma  is a group of frogs.  People call them Darwin's frogs and mouth-breeding frogs in English. They live in Chile and Argentina.

These frogs are different from other frogs because the male frog keeps the young in his mouth. The female frog lays eggs and the male frog watches the eggs. Once the tadpole is big enough to move inside its egg, the male frog puts the eggs in his mouth. The eggs do not go to the frog's stomach. They go to the frog's vocal sac, the organ he uses to make sounds. The eggs hatch inside the male frog's vocal sac and the tadpoles stay there. R. darwinii tadpoles stay in the vocal sac until they become small frogs. R. rufum tadpoles stay in the vocal sac until they have strong jaws and food organs. Then the male R. rufum frog puts them in the water, where they swim and find food.

Species
There are two species in this group:
Rhinoderma darwinii Duméril and Bibron, 1841
Rhinoderma rufum (Philippi, 1902) 
References

Category:Frogs of South America