The word crepuscular is interesting, it comes from crepusculum, a Latin word relating to dawn and dusk or darkness. A crepuscular animal or event is different to nocturnal (during night) or diurnal (during daylight).
Here at this link is an example of a fine crepuscular mammal, Ireland's most elusive - the pine marten: https://panoramicireland.com/photo-tours-blog/photographing-pine-martens-in-ireland-wildlife-photography
So, usually when one is photographing crepuscular rays of sunlight across the evening landscape, pine martens are out playing in the fields and woodlands of the countryside.
Join me, on one of my residential photography workshops in the west of Ireland to photograph sunsets, landscapes, heritage, seascapes and pine martens.
Places are limited but available year round on a private or small group basis - contact me to find out more information and ask any questions.