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Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight.Birds have a light skeletal system and light but powerful musculature which, along with circulatory and respiratory systems capable of very high metabolic rates and oxygen supply, permit the bird to fly.
Brains of an emu, a kiwi, a barn owl, and a pigeon, with visual processing areas labelled. The avian brain is the central organ of the nervous system in birds. Birds possess large, complex brains, which process, integrate, and coordinate information received from the environment and make decisions on how to respond with the rest of the body.
If one saw an owl or heard its hoot, someone was going to die. In general, owls are viewed as harbingers of bad luck, ill health, or death. The belief is widespread even today. [55] The Hindu goddess Lakshmi with the owl. In Hinduism, an owl is the vahana (mount) of the goddess Lakshmi, especially in the eastern region of India. [56]
As an example, the great tit, a European songbird, uses such a signal to call on nearby birds to harass a perched bird of prey, such as an owl. This call occurs in the 4.5kHz range, [66] and carries over long distances. However, when such prey species are in flight, they employ an alarm signal in the 7–8 kHz range.
The feathers on the edge of barn owl’s face creates a disc that works to trap and focus sound, similar to the outer ears of humans. The sound waves travel through the owl’s ear canal until they reach the eardrum, through the ossicles, and into the inner ear so that the owl is able to perceive exactly where their prey is located.
The great horned owl (Bubo virginianus), also known as the tiger owl (originally derived from early naturalists' description as the "winged tiger" or "tiger of the air") [3] or the hoot owl, [4] is a large owl native to the Americas. It is an extremely adaptable bird with a vast range and is the most widely distributed true owl in the Americas. [5]
The spotted eagle-owl (Bubo africanus), also known as the African spotted eagle-owl and the African eagle-owl, is a medium-sized species of owl, one of the smallest of the eagle owls. Its length is 45 cm (18 in) and its weight is from 454 to 907 grams (1.0 to 2.0 lb). It has a 100 to 140 cm (39 to 55 in) wingspan. [3]
The northern saw-whet owl has a round, light, white face with brown and cream streaks; they also have a dark beak and yellow eyes. The underparts are pale with dark shaded areas; the upper parts are brown or reddish with white spots. Juveniles have a dark brown head and wings, and a tawny rust-colored breast and belly.