"Most of the range is encompassed in the "Diamond A Ranch" (formerly the "Gray Ranch"), which is owned and managed by the Animas Foundation.The 321,000 acre (1,299 km²) ranch (more than one third the size of the state of Rhode Island - 3140 km2) was bought in 1990 by The Nature Conservancy, which took the unusual step of selling it in the mid-1990s to the Animas Foundation, a private organization founded by poet and rancher Drummond Hadley and funded in part by the Anheuser-Busch family (as opposed to selling it to an arm of the U.S. government).