What is hiding behind those feathers when a Bald Eagle takes a breath?
In this episode of the Beyond Wild Media Bald Eagle Anatomy Series, we look inside the bird's air-sac system.
Birds have thin-walled air sacs connected to their respiratory system. These structures act like bellows, helping move air through the respiratory system.
The air sacs aren't simply extra lungs. They work together with the lungs as part of a respiratory system adapted for the demands of an active flying animal.
You normally can't see any of this when watching an eagle soar.
