Nocturnality is a behavior in some non-human animals characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite.
Owls are well known for being nocturnal, but some owls are active during the day.
The kiwi is a family of nocturnal birds endemic to New Zealand.
The honey badger, a nocturnal animal.
Light pollution on a ski slope in Finland gives the area a hazy, brightened sky.
Ethology is a branch of zoology that studies the behaviour of non-human animals. It has its scientific roots in the work of Charles Darwin and of American and German ornithologists of the late 19th and early 20th century, including Charles O. Whitman, Oskar Heinroth, and Wallace Craig. The modern discipline of ethology is generally considered to have begun during the 1930s with the work of the Dutch biologist Nikolaas Tinbergen and the Austrian biologists Konrad Lorenz and Karl von Frisch, the three winners of the 1973 Nobel Prize in Physiology or Medicine. Ethology combines laboratory and field science, with a strong relation to neuroanatomy, ecology, and evolutionary biology.
Great crested grebes perform a complex synchronised courtship display.
Male impalas fighting during the rut
Charles Darwin (1809–1882) explored the expression of emotions in animals.
Kelp gull chicks peck at red spot on mother's beak to stimulate regurgitating reflex
