Federal wildlife officials declared a rare lizard in southeastern New Mexico and West Texas an endangered species Friday, citing future energy development, sand mining and climate change as the biggest threats to its survival in one of the world’s most lucrative oil and natural gas basins.

“We have determined that the dunes sagebrush lizard is in danger of extinction throughout all of its range,” the U.S. Fish and Wildlife Service said. It concluded that the lizard already is “functionally extinct” across 47% of its range.

Much of the the 2.5-inch-long (6.5-centimeter), spiny, light brown lizard’s remaining habitat has been fragmented, preventing the species from finding mates beyond those already living close by, according to biologists.

“Even if there were no further expansion of the oil and gas or sand mining industry, the existing footprint of these operations will continue to negatively affect the dunes sagebrush lizard into the future,” the service said in its final determination, published in the Federal Register.