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 ...

Some animals have adapted to life after dark, thriving when the rest of the world is asleep. Here are 13 creatures that spend most of their lives in the night, revealing the wonders of the ...

Humans, who function mainly in the daylight, are diurnal. Other diurnal animals include lions, killer whales and polar bears, according to Animalia. Because cats don’t seem to fit the diurnal mold.

Get a rare close-up look at the elusive aardvark, one of Africa’s most fascinating and secretive nocturnal animals. From its long snout and powerful claws to its curious behavior, this intimate ...