The squid’s smaller eye (not seen) points down into the dark below, detecting bioluminescent prey and predators. Among the tools of aquatic animals with camera-like eyes: a lens with varying ...

Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more widely in low light. So, at the outset, nocturnal eyes gather more light than ...

If animals have eyes to let light in ... This means they can see better in the dark – very useful for hunting, and they can also see the traces of other dogs’ wee. Well, you know what dogs ...