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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.
(adjective) Diurnal describes birds that are principally active during the day with all major life activities, including courtship, nesting, feeding, preening and other behaviors. Most species of birds, including songbirds, hummingbirds and waterfowl are considered diurnal.