鸟类因为生态习性上的差异可分为留鸟和候鸟。留鸟终年留居在一个地区,或是仅作短距离的漂泊或短距离的垂直迁徙。候鸟则具有因季节不同而作长距离迁徙、变更栖息地区的习性。燕子春来秋去,鸿雁春去秋来,会随着季节的变化,年复一年地重复着这一自然现象。在我国长江流域,家燕是夏候鸟。每年春分前后,飞来繁殖育雏;到了秋季天气转凉,它们又成群结队地飞往南方,最远可到达马来西亚和印度尼西亚 Birds because of differences in ecological habits can be divided into resident birds and migratory birds. Resident birds live in an area all year round, or only for short-distance wandering or short-distance vertical migration. Migratory birds are due to different seasons for long-distance migration, habitat change habitats. Spring comes to autumn swallows, goose spring goose, will change with the seasons, repeat this natural phenomenon year after year. In China’s Yangtze River valley, swallow is a summer migratory birds. Before and after the annual equinox, fly to breed brooding; in autumn the weather turns cooler, they flew in droves to the south, the farthest reach Malaysia and Indonesia