迁徙是指动物周期性的较长距离往返于不同栖居地的行为。根据鸟类迁徙的行为,可以将鸟类分成留鸟和候鸟。留鸟是那些没有迁徙行为的鸟类,它们常年居住在出生地,大部分留鸟甚至终身不离开自己的巢区,有些留鸟则会进行不定向和短距离的迁移;候鸟是那些有迁徙行为的鸟类,它们每年春秋两季沿着固定的路线往返于繁殖地和避寒地之间。 Migration refers to the animals periodically longer distance from different habitats. Birds can be divided into resident birds and migratory birds according to their migration behavior. Staying birds are those birds that do not migrate. They live all the year round at their place of birth. Most of the remaining birds do not even leave their nesting area for the rest of their life. Some migratory birds migrate both non-directional and short distances. Migratory birds are migratory birds Class, they spring and autumn every year along the fixed line between the breeding ground and cold shelter.