1. The Nearctic region is known for its diverse wildlife and unique plant species.

北美洲的生物区系以丰富多样的野生动植物种类而闻名。

2. Many migratory birds breed in the Nearctic region and winter in the Neotropics.

许多候鸟在北美洲繁殖，然后在新热带区越冬。