Stay out of dark caves for starters. If you do decide to go in one just make sure there’s no gators first because you might stumble upon something like this. An orange nose and glowing eye’s starring at you.
Caves are scary places – especially ones filled with crocodiles. “I was crawling through the cave and suddenly there were two red eyes,” says explorer Olivier Testa. “It was frightening!”
In 2010, he was part of an expedition into Gabon’s Abanda cave system following a tip-off about a population of dwarf crocodiles living there.
While crocs sometimes retreat underground during droughts, this is the first population documented taking up long-term residence in caves.
The team’s crocodile expert, Matthew Shirley from the Rare Species Conservatory Foundation, soon realised why they had done so: a bounty of ready-made snacks was falling into the water or lining up to be plucked off the cave walls.
“You walk in and there are just bats and crickets everywhere,” he says. “The crocodiles are pretty good hunters anyway, but even if they didn’t have to pull bats off the walls, there are individuals falling to the floor all the time.” He told NewScientist
Thanks to a steady diet of bats and other cave critters, the crocs appear to be in better physical condition than their forest counterparts, especially the young ones.
With at least 5 kilometres of caves to occupy, it’s difficult to precisely know how many crocs are taking advantage of this banquet. However, based on the team’s exploration up to 100 metres into the cave system, Shirley reckons there are at least 50, and probably many more.
As the team headed further into the caves, they made an unexpected discovery: in the deeper recesses, the older, dark-coloured males had become paler, turning a bright orange. Were they losing unnecessary pigment in a similar way to other cave-dwelling animals, such as Mexican blind cavefish?
Shirley doesn’t think so. Cave crocs must maintain contact with the outside world for one simple reason. “They cannot reproduce in the caves,” he says. “It’s a nesting ecology thing: they need big mounds of rotting vegetation to lay their eggs in.”
So while the crocodiles appear to spend the entire dry season in the caves, they emerge during the wet season – at least to breed. Instead of the colour change marking an early stage of subterranean adaptation, Shirley has a more disgusting explanation.
The water these crocodiles swim through is essentially an alkaline slurry formed from bat droppings. “The urea in bat guano makes the water very basic,” he says. “Eventually that will erode away the skin and change its colour.”
That’s some crazy real world stuff. I think I’ll leave the exploring up to the explorers and just read about it.
Orange Croc’s are crazy