In a Slovenian cave visited by a million tourists every year, a bizarre and rare amphibian is guarding a significant clutch of eggs.
The olm, a blind salamander found in cave rivers of the Balkans, is thought to live for more than 100 years but reproduces just once or twice a decade.
A female in an aquarium at the Postojna Cave has laid 50-60 eggs – and three of them are now showing signs of growth.
Nobody knows how many will hatch, or even precisely how long it will take. “Right now it looks like three are good candidates,” Saso Weldt, a biologist working at the cave, told the BBC.