谁能用英语介绍一下“候鸟”

Many birds have migrated along the latitude of the characteristics of the season, the summer when these birds in the temperate regions of high latitude propagation, when winter in lower latitudes over the winter in tropical areas.夏末秋初when these birds migrate from breeding grounds to wintering in the south, and in the spring from wintering in the North to return to the breeding grounds. With the seasonal changes in these north-south migration of birds as "birds" (migrant).
Observation on specific locations, these migratory birds may be in accordance with the南来北往they appear to be classified in different time, to Taiwan as an example, the summer came to Taiwan from southern breeding birds as "birds summer" (summer visitor) winter came from the north of migratory birds wintering in Taiwan is referred to as "migratory birds in winter" (winter visitor). If migratory birds in northern Taiwan than in the breeding areas, in the more southern parts of the w