![soaring birds use their lungs to modify mechanics of flight](https://utterbuzz.com/wp-content/uploads/2024/06/soaring-birds-use-their-lungs-to-modify-mechanics-of-flight-640x426.jpg)
An air-filled sac within the birds’ lungs is believed to increase the force the birds use to power flight muscles while soaring.
An air-filled sac within the birds’ lungs is believed to increase the force the birds use to power flight muscles while soaring.