Incubators - Who did it first?

Man makes incubators to hatch eggs, but in this he is a latecomer. Sea turtles and some birds lay their eggs in the warm sand for incubation. Other birds will lay their eggs in the warm ashes of volcanoes for hatching. Sometimes alligators will cover their eggs with decaying vegetables matter to produce heat. But in this the male mallee bird is the expert. He digs a big hole, fill it with vegetable matter and cover it with sand. The fermenting vegetation heats the mound, the female mallee bird lays an egg in it weekly for up to six months, and all that time the male checks the temperature by sticking his beak into the mound. By adding or removing sand, even in weather from below freezing to very hot, he keeps his incubator at 92 degrees Fahrenheit.