Some time during the late 1980s, a female black bear from the Sierra del Carmen in Northern Mexico started a journey. She descended from the mountains, crossed miles of desert, swam across the Rio Grande, and traversed more desert to reach the forested slopes of the Chisos Mountains in Big Bend National Park. She may have led offspring to the Chisos, and probably encountered a wandering male already using the mountain range. Researchers do not know exactly why the bears returned, but it is due in part to the preservation and restoration of habitat in the park.
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