birds and the origin of flight. major features the aves or birds contains about 9,000 species,...
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Birds and the Origin of Flight
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Major Features
The Aves or birds contains about 9,000 species, ranking it second only to the bony fish in number of species
Feathers Associated with flight - the major characteristic feature
of birds is the capacity for flight. modified scales
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Feathers as Insulation
The evolution of feathers may have been important in providing insulation that would help maintain a body temperature higher than that of the surrounding environment.
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Feathers and Flight
Being airborne, birds have more mobility and access to resources.
Not all birds are capable of flight, but flightless birds are evolutionarily derived from flying ancestors.
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Adaptations for Flight
Things that fly must be made to fit strict specifications.
This is why most birds have a similar body shape, even though they live in very different habitats and have very different diets.
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Adaptations for Flight
Reduction in the weighthollow construction of the skeleton
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Adaptations for Flight
Fusion and loss of bones and teeth
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Adaptations for Flight
Fused clavicles and keeled sternum
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Adaptations for flight
4-chambered heart
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Adaptations for flight - respiration
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Adaptations for Flight
Reduced urogenital system
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Flight – the basics
Lift (airfoil)
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Flight – the basics
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Birds are theropod dinosaurs
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