Human eyes, like the eyes of the leopard's prey, become useless in low light. Until recently, this meant that we had no way of observing the night behavior of leopards. Today, infrared-sensitive ...

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 ...

The amur leopard is considered to be facing an extremely high risk of extinction in the wild, with a 2007 census counting only 14-20 adults and 5-6 cubs in the south-western Primorye region of Russia.