Hey, Four Eyes!
Meet Anableps anableps, the fish so nice they named it twice. Not only did they name it twice, they gave it eyes twice.
Well, they don’t really have four eyes, but they do four retinas. As they feed on aquatic insects at the surface, one half of their eye takes in light from above the water while the other half takes in light from below.
As if that wasn’t weird enough, they allegedly prefer to mate on one side of their body, and they will only choose mates who prefer the other side. I guess everyone’s got a fetfish.