Sunday, July 24, 2011

Definitions relating to when an animal, bird, or insect is active.

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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