Animals that are active during the day are referred to as "diurnal." This term contrasts with nocturnal animals, which are mainly active at night. Diurnal species typically have adaptations that allow them to thrive in daylight, including good color vision and behaviors that optimize their foraging and social activities during sunlight hours. Examples of diurnal animals include many birds, mammals such as humans, and certain reptiles. Being diurnal allows these animals to benefit from the warmth of the sun while avoiding competition with night-active species for food resources and territory.