I have posted that the Cuero, a mythical lake creature that is said to inhabit Patagonian lakes is a freshwater stingray.
I got to see one recently during my vacations (not in Patagonia or Argentina by the way), swimming in a salt water aquarium.
I took some photographs, one of them is posted above. It is quite an impressive being, moving slowly, gliding through the water. Notice that it has had its barb cut off to avoid harming the keepers.
It is quite likely that a creature such as this gave rise to the Cuero myth.
Patagonian Monsters - Cryptozoology, Myths & legends in Patagonia
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