Diamond A Ranch preserves rare wildlife in Hidalgo County bootheel

Diamond A Ranch spans 500 square miles in Hidalgo County’s bootheel. The landscape helps determine where animals move, where water-sensitive habitat survives, and how fire is handled across a stretch of New Mexico that still depends on working ranches as much as on conservation.

Why Diamond A Ranch matters in the bootheel

The ranch includes the former Gray Ranch, a 321,000-acre core area where The Nature Conservancy lists more than 700 plant species, 75 mammals, 50 reptiles and amphibians, and more than 170 breeding bird species. The ranch is not a park with public turnstiles; the Animas Foundation discourages visitors and manages the land for natural values alongside the cultural and economic heritage of the bootheel country.

When a property that large stays intact in the bootheel, it affects whether wildlife can cross the landscape, whether grasslands stay open, and whether nearby ranching operations remain part of a continuous working range instead of being broken into smaller parcels.

A landscape built for movement

Diamond A Ranch lies in the Sky Islands region, where mountain ranges rise out of the Chihuahuan Desert and create a patchwork of habitats. On one ranch, that can mean black grama grasslands, Madrean oak woodlands, and Fremont cottonwood riparian forests existing in close proximity, each supporting different species and different land-management needs.

The ecosystem includes ridge-nosed rattlesnake, Baird’s sparrow, white-sided jackrabbit, and pronghorn.

The county sits along the Mexico border within a broader network of southeastern Arizona and southwestern New Mexico rangelands, and uninterrupted open space gives wildlife room to move between grassland, woodland, and riparian cover as seasons shift and conditions change.

Water, grass, and the cost of fragmentation

The ranch’s riparian forests are especially important because they track water through a dry landscape. Fremont cottonwood stands depend on drainage and groundwater-linked conditions that are far rarer than upland grassland, so protecting those corridors helps preserve the county’s most water-sensitive habitat as well as the species that rely on it.

The tradeoff is that keeping land intact usually means accepting a very different kind of development picture. Instead of subdivision, road networks, and scattered parcels, Diamond A Ranch has stayed tied to ranching and conservation management, which limits public access but also preserves a large working landscape that can still absorb ecological shocks better than a fragmented one.

That approach took money and legal structure. The Nature Conservancy bought the Gray Ranch in 1990, kept a conservation easement in 1993, and later transferred the property to the Animas Foundation. The Nature Conservancy called the purchase an $18 million transaction and, at the time, the largest single private conservation acquisition in U.S. history.

How the Malpai Borderlands shaped the model

Diamond A Ranch is part of the larger Malpai Borderlands story, which began as informal discussions among ranching neighbors and became a nonprofit in 1994. The effort began in 1990, and four ranchers later completed land-use easements with the Malpai Group and the Animas Foundation to prevent subdivision of private ranchland.

That model brought ranchers, scientists, and public agencies into the same conversation. The Malpai Borderlands Group works on land restoration, endangered species habitat protection, cost-sharing range and ranch improvements, and land conservation projects, all aimed at keeping ranchlands productive while avoiding the kind of fragmentation that can unravel both habitat and local livelihoods.

The Malpai Borderlands region covers nearly one million acres of virtually unfragmented open space, and The Nature Conservancy counts about 4,000 plant species, roughly 295 bird species, and dozens of butterfly species in the broader region.

Fire management as a county stake

Fire is one of the clearest places where conservation and ranching overlap. Historical overgrazing and aggressive fire suppression contributed to woody encroachment and fuel buildup in the grasslands, conditions that make it harder to hold open country in a fire-adapted landscape.

The response in the Malpai Borderlands has been to reintroduce fire as a management tool. The Animas Foundation’s operating programs include grassland restoration using fire as a natural process, reflecting a strategy that treats prescribed fire and working ranch management as part of the same ecological system.

Better fire management can reduce fuel loads across open range, but it also demands coordination, timing, and tolerance for short-term disruption such as smoke, temporary grazing changes, and the careful planning needed to burn safely near ranch infrastructure and borderland homes.