More than 300 species of birds migrate and nest there.

Their flight is not powerful, but can continue for long periods, and many species migrate annually.

Large species migrate slower than small ones, for a given force.

Only a few species migrate, most remaining resident in their tropical environment.

A few common birds are on display, and many additional species migrate through the area at various times of the year.

There is nowhere else, at least in the near future, to which our species could migrate.

Most are native all year, but some species migrate to warmer areas during the winter.

In winter, both species migrate south to Mexico, where they are virtually indistinguishable from one another.

The species usually migrates to high latitudes in the warm season.

Whether a particular species migrates depends on a number of factors.