Why Amazonian Butterflies Hover Over Yellow-Spotted Turtles

Visitors that dare to venture deep into the Western Amazon rainforest often encounter a strange sight - groups of butterflies hovering above yellow-spotted river turtles that are basking in the sun. What's even stranger is why they are there - To drink the tears from their eyes! And it's not because the beautiful insects are trying to comfort the reptiles, but because the tears contain the one ingredient that is lacking in their diet - sodium.