These resilient creatures thrive in various aquatic environments and are especially notable for their three eyes, a rare trait among aquatic animals. Triops possess two compound eyes and a central ...

This marks the point when light detection becomes vision proper and when bundles of photoreceptors become bona fide eyes. Animals with stage-three eyes can find suitable homes, as sea stars do ...

The images below each show a scene as viewed by a human. Drag the slider to the left to see how an animal would see the same scene. Whereas human eyes contain three types of colour-detecting cells, ...