The most extraordinary thing about this animal is the mating ritual. A male will clasp a female from the back, pressing her extended cloaca onto her back, and stimulating the skin on her back to swell. They will then somersault through the water (still clasped together), rising toward the surface. As they flip over, the female will lay 3 to 10 eggs, which will fall against the males' belly. He fertilizes the eggs and, still somersaulting, pushes them into the female's back. This is repeated until 40 to 100 eggs are laid. (Many eggs fall during the somersaults and are lost). Afterwards, the skin on the female's back shrinks and the eggs are enveloped in the female's back, each in its own separate, translucent skin pocket. The toads undergo metamorphosis while still in the pockets. The tadpoles' tails act much like placentas, exchanging nutrients and gases between the mother and tadpole. Two to four months later the mother will molt, opening the egg pits on her back. The toads will then hatch into fully formed miniature toads.