This curious beast has been a source of entertainment and speculation ever since it was first encountered by Europeans in the 18th century. Its thick shell and broad, flat face twisted in a permanent smile makes it look like a creature from another world. But instead of an alien planet, this reptile inhabits the waterways of countries such as Ecuador, Bolivia and Peru.
To read more on this story, click here: When Experts Ran Tests On This Bizarre Creature, They Uncovered A Curious Secret In Its DNA
