Dial studies living birds called chukars.

戴尔研究了一种被称为“楚卡鸟”的现存鸟类。

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，年轻的楚卡鸟就利用正在发育的翅膀爬上倾斜的表面，到达安全的避难所。