The word crepuscular derives from the Latin crepusculum ("twilight"). Its sense accordingly differs from diurnal and … See more

The various patterns of activity are thought to be mainly antipredator adaptations, though some could equally well be predatory adaptations. Many predators forage most intensively at night, whereas others are … See more

Animal patterns of activity sometimes change during migration due to changes in environmental conditions. Mule deer are crepuscular, but they are only active at sunset before and during migration. In the spring they … See more

Crepuscular animal activity is affected by human activity, because humans are diurnal. Crepuscular animals are less likely to participate in typical foraging or reproductive behaviors and deal with increased … See more