Diurnal Animal Species refers to a group of animals that are active during the day and sleep at night, including various types of mammals, birds, insects, and reptiles. This category encompasses a wide range of species, including domestic birds, which are often kept as pets or for their produce, and flightless birds, which have adapted to life on the ground rather than in the air. The term 'diurnal' distinguishes these animals from nocturnal or crepuscular species, which are active during the night or twilight hours respectively.