Very large wild goose of northeast asia ; interbreeds freely with the graylag .

亚洲东北部非常大的野鹅；与灰雁自由杂交。

The ethologist konrad lorenz described the sunken eyes and hunched posture of newly bereft graylag geese : " a greylag goose that has lost its partner shows all the symptoms described in young human children . "

行为学家康拉德洛伦茨（konradlorenz）描述新近失亲的灰鹅（graylaggeese）眼窝深陷并且驼背：“一只失去伙伴的灰鹅展现出了所有人类孩子体现的特征。”