Diurnal: active during the day
Crepuscular: becoming active at twilight or before sunrise, as do bats and certain insects and birds.
Within the definition of crepuscular is the terms matutinal (or "matinal") and vespertine, denoting species active only in the dawn or only in the dusk, respectively.
Matutinal: active only at dawn
Vesper-tine: active only at dusk
Nocturnal: active during the night
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