Orange dwarf cave crocodiles: The crocs that crawled into a cave, ate bats, and started mutating...

Dwarf crocodiles in Gabon found living in a cave, with their skin turning orange from swimming in guano. It's unclear how long they've been down there, but genetic research indicates they may be morphing into a new species.
It's unknown how many crocodiles are living in these caves, or when they adopted this subterranean lifestyle, but they may have been down there for thousands of years — and scientists say they may even be in the process of evolving into a new species.

The cave-dwelling crocodiles were only studied for the first time in 2010, and a 2016 study that compared them to their forest-dwelling counterparts showed a number of differences between the two. Their diets are very different, with the cave crocs feeding almost exclusively on the bounty of crickets and bats that cling to the cave walls. They found the cave crocodiles were generally in better condition than those living in the forest, which the team say is likely due to the abundance of prey available and a lack of predators.