Diversity Makes the Difference. Diversity Makes the Difference - Big Bend National Park (U.S. National Park Service) Whether hiking to gain a glimpse of the colima warbler, a much sought after bird by birdwatchers which winters in Mexico but is only seen in Big Bend here in the U.S., or to get a coveted look at a mountain lion or black bear, or to see the towering displays of the century plants in bloom—whatever the reason, visitors to the Chisos are struck by the contrasts the mountains provide—prickly pear and pine tree side by side, snow-covered cactus, and a waterfall flowing through a feature called the “Window” to the desert below.