The jackdaws do not know their enemies .

穴鸟们不认识自己的敌人，

Some 100 jackdaws turned up dead on a street in sweden .

接着大约100只穴乌在瑞典街头死亡。

Lorenz studied instinctive behavior in animals , especially in greylag geese and jackdaws .

劳伦兹研究了动物的本能行为，重点研究了是灰鹅和寒鸦。