Padre Island National Seashore, separating the Gulf of Mexico from the Laguna Madre—one of the few hypersaline lagoons in the world—is a haven for over 380 species of birds. The seashore is located on the Central Flyway, an important migration route for birds migrating back and forth from North to Central and South America. From October through April, the National Seashore provides free birding guides who take visitors on a free 3-hour birding drive through the Park. Visitors can expect to see frigate birds, brown boobies and peregrine falcons who migrate here in masses in both late September and early fall and in April and May. A stunning array of birds winter at Padre Island including snow geese, blue-winged and green-winged teals, pied-billed grebes, cormorants, and a wide variety of herons.