Because they're most active after dark, opossums are described by this adjective
[DOC] [TLE] Jeopary Questions page 1141 - GEMS & JEWELRY - TriviaBistro.com [PAR] PIECE: It's the more correct name for the castle piece in a game of chess ... A 
medical condition that was present at birth is described by this 10-letter adjective 
... SCIENCE ADJECTIVES: Because they're most active after dark, opossums are
... [DOC] [TLE] About Opossums - Mass Audubon [PAR] The Virginia opossum (Didelphis virginiana) is more closely related to kangaroos 
than to any other mammal ... Their eyes are well-adapted to darkness.