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 ...

Other adaptations. Sight isn’t the only feature nocturnal animals rely on. Some depend on other senses to adapt to the darkness. Animals like owls and large cats have specialized hearing to hunt ...

Night active animals have eyes that are rich in rod cells. Nocturnal animals have a mirror-like membrane at the back of their eyes behind the retina that basically reflects light back through the eye.

Nocturnal animals have a higher percentage of rod cells, which work well in dim light and are sensitive to movement. The tradeoff is a reduced number of cone cells, rendering them color blind and ...