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How do nocturnal animals know it's night if a light is on?

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They know it's nighttime, there's just a wierd light out. Look in the opposite direction and you see the usual dark. In major cities with a lot of light at night, however, you might see some unusual animal behavior (just as you would if you had lights in your face when trying to sleep). read more

A new report from Sweden's Lund University concludes that many animals that are active at night depend on individual stars or light from our galaxy to be mobile after the sun goes down. Specifically, migrating birds, dung beetles, moths, frogs and seals, among others, rely on light from outer space. read more

Most people understand that animals are active during the day (diurnal) or night (nocturnal). For example, robins are active during the day and raccoons are active at night. While there is a third category, crepuscular (dawn and dusk), the binary understanding of animal behavior is a useful way to organize animals. read more

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