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comparative more crepuscular, superlative most crepuscular
Of or resembling twilight; dim. examples
(zoology) Active at or around dusk, dawn or twilight. quotations
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