crepuscular

Etymology

Learned borrowing from Latin crepusculum + -ar.

adj

  1. Of or resembling twilight; dim.
  2. (zoology) Active at or around dusk, dawn or twilight.
    That's why cats are crepuscular — most active at dawn and dusk — because mice and rats forage for food during these hours when fewer of their natural enemies are around. 1999, J. Anne Helgren, Communicating with Your Cat, page 51

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