1.Dial studies living birds called chukars.

戴尔研究了一种被称为“楚卡鸟”的现存鸟类。机翻

2.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。机翻

3.Studies of living birds, like chukar partridges, have shown that birds can get a better grip on inclined surfaces, like tree trunks and rocks, when they flap their wings as they run.

chukar 鸪等现存鸟类的研究表明，鸟类在奔跑时拍打翅膀可以更好地抓住倾斜的表面，例如树干和岩石。机翻