Flamingos have evolved very leathery skin on their legs so they can tolerate the salt water, says David Harper, a professor at the University of Leicester.
2017年12月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
粗糙的；粗涩的；似皮革的
If the texture of something, for example someone's skin, is leathery, it is tough and hard, like leather.