MIGRATORY BIRD ROUTES IN MEXICO
Mexico’s geographical position, makes it a critical territory for North American migratory species. Three of the main waterfowl flyways, the Pacific, Central and Mississippi migration routes, are yearly utilized by many species, to overwinter in, or as passage through Mexico.
The movement of birds in Middle America is probably the poorest known aspect of biogeography in North American vertebrates. Neotropical migrants are composed of intratropical, neartic-neotropical, altitudinal and neaustral-neotropic migrants. Individuals of the first three categories are common at stopover sites in southern Mexico. The Isthmus of Tehuantepec is the northernmost narrowing of North American continental landmass, causing a funneling and concentration of neartic-neotropic landbirds migrants. (Winker, 1995)