Grulla can be distinguished from grey in that the head is dark and the color does not change with age.

Grulla可以区分从灰色，头部暗的颜色没有变化，随着年龄的增长。

youdao

Grulla can be distinguished from grey in that the head is dark and the color does not change with age.

Grulla可以区分从灰色，头部暗的颜色没有变化，随着年龄的增长。

youdao