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Bird migration is controlled primarily by day length, signalled by hormonal changes in the bird's body. [20] On migration, birds navigate using multiple senses. Many birds use a sun compass, requiring them to compensate for the sun's changing position with time of day. [21] Navigation involves the ability to detect magnetic fields. [22]
A flock of auklets exhibit swarm behaviour. Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot or perhaps moving en masse or migrating in some direction.
Animal navigation is the ability of many animals to find their way accurately without maps or instruments. Birds such as the Arctic tern, insects such as the monarch butterfly and fish such as the salmon regularly migrate thousands of miles to and from their breeding grounds, [1] and many other species navigate effectively over shorter distances.
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The Life of Birds is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 21 October 1998.. A study of the evolution and habits of birds, it was the third of Attenborough's specialised surveys following his major trilogy that began with Life on Earth.
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The ibis (/ ˈ aɪ b ɪ s /) (collective plural ibises; [1] classical plurals ibides [2] [3] and ibes [3]) are a group of long-legged wading birds in the family Threskiornithidae that inhabit wetlands, forests and plains. [4] "Ibis" derives from the Latin and Ancient Greek word for this group of birds.
Anything that moves through the air produces drag due to friction. The aerodynamic body of a bird can reduce drag, but when stopping or slowing down a bird will use its tail and feet to increase drag. Weight is the largest obstacle birds must overcome in order to fly. An animal can more easily attain flight by reducing its absolute weight.