If my mate ever complains about the rigors of pregnancy, I’m just going to point her to this video of the Surinam Pipa toad.
Surinam toads are most well-known for their remarkable reproductive habits. The partners rise from the floor while in amplexus and flip through the water in arcs. During each arc, the female releases 3-10 eggs, which get embedded in the skin on her back by the male’s movements. After implantation the eggs sink into the skin and form pockets over a period of several days, eventually taking on the appearance of an irregular honeycomb. The larvae develop through the tadpole stage inside these pockets, eventually emerging from the mother’s back as fully developed toads, though they are less than an inch long (2 cm).