This story appears in the April 2017 issue of National Geographic magazine. The fish’s eyes are ideally suited to helping it thrive and propagate. The fish’s loins, on the other hand, are a somewhat ...

“Hey, four-eyes!” That playground taunt is more accurate when applied to Anableps anableps—a fish related to the guppy. It lives in the brackish waters of mangrove swamps in central and South America, ...

A number of anableps anableps at Living Coasts in Torquay, Devon, were seen exhibiting the unusual behaviour. Staff at the zoo, which is home to 38 of the fish, hope research will now be carried out ...