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29.5 The Reptiles -- Part 3
The collarbone is fused with the wishbone in birds.
The skeleton is more rigid due to the fused bones.
A bird's ability to fly is determined by the breast muscles attached to the keel.
A horny beak has replaced jaws with teeth, and a slender neck connects the head to a rounded, compact torso.
Birds have lungs that connect to air sacs.
The presence of these sacs means the air circulates one way through the lungs.
Air sacs lighten the body and bones for flying.
There are air sacs in the bones.
Birds generate heat.
Many people can use heat to keep their temperature constant.
They may be associated with endothermy.
Birds have well-developed brains.
Their reflexes are excellent.
An enlarged portion of the brain is thought to be responsible for instinctive behavior.
A ritualized courting is done before a couple gets married.
Newly hatched birds need parental care before they can fly.
Many bird species migrate over long distances during the season.
Birds use the sun and stars and the Earth's magnetic field to navigate through the day and night.
Birds are loud.
Their vocalizations convey a lot of information.
The majority of birds have the ability to fly.
Some birds, such as emus, are flightless.
Birds have been classified according to their beak and foot type in the past.
A bald eagle has a beak.
A bird's beak is used to chisel wood.
A bird's beak is modified to open nuts.
A cardinal has a beak.
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