Kaup's Caecilians are worm-like amphibians native to tropical regions. Unlike frogs, however, these amphibians give birth to live young. No eggs required. The really crazy thing here is that, instead of using a placenta to transfer oxygen and nutrients from the mother to the babies, Kaup's Caecilians seem to use an organ that looks very much like detachable gills. Babies are born with these gill sacs and then discard them after birth.