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crepuscular
Crepuscular animals are those that are active primarily during twilight (i.e., dawn and dusk).
==Etymology and usage==
The word ''crepuscular'' derives from the Latin ''crepusculum'' ("twilight"). Its sense accordingly differs from diurnal and nocturnal behavior, which respectively peak during hours of daylight and dark. The distinction is not absolute however, because crepuscular animals may also be active on a bright moonlit night or on a dull day. Some animals casually described as nocturnal are in fact crepuscular.
Special classes of crepuscular behaviour include matutinal (or "matinal") and vespertine, denoting species active only in the dawn or only in the dusk, respectively. Those that are active during both morning and evening twilight are said to have a bimodal activity pattern.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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