候鸟的阳性率极显著高于留鸟。

The positive rate of migratory birds is higher than resident birds.

留鸟种类秋季最多（67．7％），春季的迁徒鸟种类最多（57．4％）。

There was the most resident bird species (67.7%) in autumn and the most migratory bird species (57.4%) in spring.

但是其他的则是雏鸟和留鸟，这表明寄生虫能够在北部大雪原完成生命循环。

But others were hatchlings and resident birds-indicating the parasite can complete its full life cycle in the Great White North.

喜鹊是我国北方城市的留鸟，其数量的多少与城市生态环境质量有明显的相关性。

Magpie is widespread resident birds in the North of China. The amount of magpie has evident pertinence with the quality of urban ecological environment.