List the main adaptations of birds to flight.

The bird class is a warm-blooded egg-laying animal. Some species of birds, or rather most of them, have acquired the ability to fly, that is, to be in the ground-air environment.

For this ability, the structure of the body and its functions have certain characteristics.

Double breathing. The ability to enrich the blood with oxygen both during inhalation and exhalation.
Body shape that reduces air resistance.
Lightweight skeleton. There are air cavities in the bones of birds.
Light feather cover.
Acquisition of a special bone – a keel.
The forelimbs are modified into wings.
Changing the nervous system for better coordination in space.

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