They are Darwin's frogs. Named after the English naturalist, Charles Darwin, the rare and endangered species switch roles when it comes to ‘giving birth’ to their young. While

The birth of 33 frogs at the London Zoo has been hailed as a “landmark moment” in the ongoing battle to save an endangered species that was first described by Charles Darwin during his epic voyage on HMS Beagle in the early 1800s.

This is the Southern Darwin Frog, named after the famed scientist. The creatures were first discovered in Chile in 1841, but recently they nearly went extinct after the chytrid fungus wiped out 90% of the species.