They're some of the strangest animals in the world and soon there might be one more of them.
The blind cave salamander known as the olm was first described over 300 years ago, when Central European villagers still believed the creatures to be baby dragons that had been washed from their mothers' dens, but eggs of the elusive amphibian have never been found in the wild.
"It is very significant because there is not a lot of data [about] the reproduction of this group of animals," Croatian biologist Dušan Jelić told the BBC. "In the wild, we never find eggs or larvae. They are probably hidden within some very specific localities within the cave systems."
Since then, the female olm has laid around 50 more eggs and several reportedly show signs of growth.