第 1 季，第 2 集: Birds have adapted perfectly to the air space and honed the skills needed to fly. Though take-off is exhausting, and landing can be fraught with difficulties, birds are the masters of the air. They can fly with their wings back at speeds in excess of two hundred miles per hour, or remain in a completely stationary hover. But how do birds even manage to stay airborne?
Documentary · 1998年1月1日 · 49 分钟