In winter , some of these migrating birds live in the southeastern u . s . , but most fly further afield in search of neotropical climates 在冬季，这些候鸟住在美国东南部的，但大部分飞更远寻找热带气候。
4.
The main provinces are the boreal , which coves all of the north temperate ; the neotropical , covering tropical central and south america ; the paleotropical , covering tropical africa and asia ; the australian ; the cape province , covering a small area around the cape of good hope ; and the antarctic , including new zealand and temperate south america 主要的植物区包括：泛北极植物区，覆盖了所有的北温带；新热带植物区，覆盖热带中部和南美洲；旧热带植物区，覆盖非洲热带和亚洲；澳洲植物区；好望角植物区，覆盖好望角周围的一个较小的区；南极植物区，包括新西兰和南美温带。
