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From Wikipedia, the free encyclopedia. Diurnal motion (Latin diurnus â²dailyâ², from dies â²dayâ²) is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles.
Best Answer: They are referred to as diurnal animals. A diurnal animal (dÄ«-Å­r'nÉl) is an animal that is active during the daytime and sleeps during the night. Animals that are not diurnal are either nocturnal (active at night) or crepuscular (active primarily during twilight). Many animal species are diurnal, including many mammals and birds.