Dial studies living birds called chukars.

研究了一种被称为“鸟”现存鸟类。

He found that long before they can fly, young chukars use their developing wings to scramble up inclined surfaces to a safe refuge.

他发现，早在能够飞翔之前，年轻鸟就利用正在发育翅膀爬上倾斜表面，到达安全避难所。