RBC I The Zapata Ranch in southern Colorado is one of the few places that bison can still roam freely. Until recently, scientists and volunteers surveyed the herd the old-fashioned way: with binoculars and the naked eye.
“It’s a shock how you can lose track of 2,000 bison on a 45,000-acre unfenced pasture,” says Chris Pague, Colorado Nature Conservancy senior conservation ecologist. But last year, The Nature Conservancy counted the herd using an increasingly ubiquitous…
