How do animals take to the air? Each has its own special techniques. But they must all overcome one of the planet's most powerful and universal forces—gravity.
How do animals take to the air? Each has its own special techniques. But they must all overcome one of the planet's most powerful and universal forces—gravity.
General Note
Originally released by BBC, 2016.
Streaming video file encoded with permission for digital streaming by Infobase on May 22, 2019.