The fall migration of Broad-winged Hawks from the breeding areas
of the forests of eastern North America to the wintering grounds in
South America is an example of a seasonal migration that spans
two continents. In this map from 1998 Broad-winged Hawk Survey data,
the size of the dots indicate the number of birds reported
during the time interval shown in the time bar at the top of the map.
Note the high numbers reported on the western side of the Gulf of
Mexico, where the birds funnel into a narrow corridor on their way south.