English example sentences with "diurnal"

The net gravitational field at any point on the surface of the earth is the sum of the gravitational fields of all the masses in the universe; hence it displays diurnal and seasonal variations and variations with the phases of the moon and Jupiter; and those variations vary with latitude: if you live far from the poles, you weigh more at night.
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I tried to explain to my mother that humans are diurnal species, that it isn't good to stay up all night and keep irregular hours, but you know my mom, she doesn't listen to reason.
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Cheetahs are diurnal because their hunting technique relies on sight.
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Degus make lovely pets: they are diurnal and hence are awake when you are.
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The jaguarundi appears to be primarily diurnal.
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