Griffith Park’s late celebrity mountain lion P-22 took the night shift to avoid hordes of hikers, bikers and dawdlers who frequented his home in the heart of Los Angeles — and it’s a pattern ...

P41, the most nocturnal mountain lion in the study, lived in the Verdugo Mountains near Los Angeles, an area with high levels of human recreation. Disclaimer: AAAS and EurekAlert! are not ...

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 ...