To Survive in Texas, Black Bears Need an Open Border

As a child Diana Doan-Crider loved hearing her grandfather’s tales of the grizzly bears and wolves he saw in the early 1900s while working to build Mexico’s railroads through the mountains. A Tepehuán Indian from Durango Mexico, he told vivid stories, and his knowledge of nature inspired her to become a wildlife biologist when she grew up and to spend decades researching black bears in northern Coahuila’s mountains, just across the Texas border.

That was an important time for black bears, which had all but vanished from Texas in the 1950s following decades of hunting, trapping and habitat loss. The animals started to return to Texas’s Big Bend National Park in the late 1980s. At first it was just a handful of bears, but soon visitors began reporting dozens sighted a year, including females with cubs.

Doan-Crider’s pioneering research, published in 1996, helped confirm what Texas wildlife managers long suspected: Black bears were regaining a foothold in southern Texas, not from other U.S. states but from Mexico.

Mexico has a thriving bear population, thanks to its mountainous expanse and greater cultural acceptance of the animals, both of which also made the recolonization possible, says Doan-Crider, who is now an adjunct professor at Texas A&M University and executive director of a nonprofit called Animo Partnership in Natural Resources.

“Mexico’s bear habitat is so huge, and some local densities are the same as what you’d see in Alaska,” she says. “You can see 25 bears in one day.”

The bears, Doan-Crider and other researchers found, were crossing into Texas from Mexico through the Sierra del Carmen Mountains, which are only separated from the mountains in Big Bend by the Rio Grande River.

Big Bend, which was established in 1944 when there were no bears in the area, is a stunning and geologically diverse landscape of mountains, desert and river…

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