Are cats nocturnal? Owners may notice their feline friends are less active during the day—but does this mean they're nocturnal? Experts explain cat behavior.

Many nocturnal animals, though not nocturnal birds, have a good sense of smell and often communicate with scent marking. That sense of smell comes from the Jacobson’s organ located in the roofs ...

As animals shift the period when they’re active, the age-old patterns of who-eats-whom may be disrupted. Food that’s a staple of a daytime diet may be harder to find at night, even as other ...

"It appears that animals are instead adjusting their activity patterns to avoid humans in time, if not space." For the study, Gaynor and her team compiled data from 76 studies on 62 species.

It is the rods that become highly specialized in nocturnal animals. In fact, many bats, nocturnal snakes and lizards have no cones at all, while other nocturnal animals have just a few.

Fear of Humans Is Making Animals Around the World Go Nocturnal Even non-threatening activities like hiking are changing creatures’ sleep cycles.

Animals like rabbits, house cats and deer are neither nocturnal nor diurnal. Instead, they're crepuscular. Jaymi Heimbuch is a writer and photographer specializing in wildlife conservation ...

Instead of sleeping at night, some animals are switching to a nocturnal lifestyle. Neil Carter is a co-author on the study, which was led by researchers at the University of California at Berkeley.

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 ...