Are cats nocturnal? Can cats see in the dark? Your pet's schedule. - USA TODAY

Cats are actually crepuscular, a term which comes from the Latin word for "twilight." Crepuscular critters are most active at dawn and dusk.

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 & Enviro… [+2136 chars]

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