Pouched Frog: the eggs are carried in a chamber on the back.
A little frog met with in the Seychelles carries its little ones about on its back, much as a duck will carry its ducklings. But the curious Surinam toad of South America has improved on this arrangement, and lodges each little one in a little pocket in the skin of her back!
Lastly, and strangest of all, we have a species—again a native of South America—in which the father carries first the eggs, and then the young tadpoles, in a pouch in his throat! This pouch, in the early part of the year, serves as a voice-organ, or, rather, as a musical organ, for when filled with air it is capable of making a sound which has been likened to that of a little bell. Later, he places the eggs therein, and, as these grow, the pouch increases in size, finally extending down each side of the body, beneath the skin, as far as the hind legs.
The Obstetric Frog, which carries its eggs twisted round the hind legs.
W. P. Pycraft, F.Z.S., A.L.S.