Nocturnal animals are animals that are active during the night and sleep during the day. The term nocturnal animal can refer to a variety of species, including the LEMUR (5 letters), which is a primate native to Madagascar; the BAT (3 letters), which is a flying mammal; the BADGER (6 letters), which is a burrowing mammal; the ratel (5 letters), which is a carnivorous mammal; and the possum (6 letters), which is a marsupial native to Australia.