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Diurnal
/daɪˈɜːrnəl/adjective / noun
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Diurnal describes something that occurs, is active, or repeats every day, particularly during daylight hours, contrasting with nocturnal patterns. In scientific contexts, it's essential for understanding biological rhythms and ecological behaviors, while in everyday use, it highlights routines tied to the sun's cycle, like daily commutes or plant growth.
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Surprisingly, about 85% of mammal species are nocturnal, making diurnal animals like humans and primates somewhat unusual in the animal kingdom, which may have evolved as a way to avoid nighttime predators. This distribution highlights how environmental pressures shape daily activity patterns across evolution.
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