If you made a journey from the southwestern United States into Mexico's Sierra Madres, you'd find yourself hiking up and down a series of peaks and ridges covered with pine and oak forests. You'd see small flocks of Mexican chickadees flitting in the tree branches and hear the loud calls of several species of jays. And you'd probably notice the incredible variety of plant life growing all around. Among the ecoregion's many plant species are agaves and other important wild relatives of our agricultural crops.
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