Internal biological clocks, also known as circadian rhythms, are universally shared by living organisms, according to the University of Illinois Urbana-Champaign’s Agricultural, Consumer & ...

Are cats nocturnal? Owners may have noticed their cats tend to be less active during the day, however this doesn't mean they only come alive at night. Cats are actually not nocturnal but rather ...

Crepuscular creatures abound in Southwest Colorado. They live in the high mountains, sage plains, ponderosa forests, desert canyons and everywhere in between. They are all shapes and sizes. Some are ...

There are nocturnal animals (active at night) and diurnal animals (active during the day). But what about those animals that are most active during dawn or dusk? The animals that are busy during these ...

Cats have strange habits. Among the most bizarre, to us humans at least, is their sleep schedules. They seem to laze around all day just to wake us up at 5 a.m. for some playtime. This begs the ...