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 ...

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 ...

Nocturnal animals have adapted to thrive in the darkness, using keen senses and specialized behaviors to hunt, navigate, and survive. Let’s take a look at some fascinating species that rule the ...

Nocturnal animals have evolved to survive in darkness. Hoffman’s two-toed sloths seldom need to come to the ground, instead feeding silently in trees, camouflaged by algae that grows in their fur.

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.

Nocturnal animals have a mirror-like membrane at the back of their eyes behind the retina that basically reflects light back through the eye. This layered membrane is called the tapetum.