If you ever get a chance to observe butterflies congregating around a reptile, it’s not just because they’re having a social get-together. It’s because some species of butterflies in the Amazon have found a surprising way to supplement their diet. Living in a sodium-poor forest, they need to get their dietary salts from somewhere. So, they’ve taken to drinking the tears of turtles, which are rich in sodium, creating one of nature’s weirdest ways to get essential nutrients.
