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  • This year's volunteers spotted bobcat tracks in the sand. © Holly Richter/TNC
  • The mapping volunteers came upon thousands of tiny toads crowded together around a small pool of water in the mostly sand-dry bed of the San Pedro River. This little puddle was the only water for nearly a mile and was desperately important to a variety of creatures. © Holly Richter/TNC
  • This stretch of the Upper San Pedro River is in Mexico. © Gerardo Carreon A.
  • Beavers Rebound: Beaver were completely trapped out of the entire San Pedro watershed in both the U.S. and Mexico for approximately a century until they were reintroduced in the past decade. © Gerardo Carreon A.
  • Every year, rancher Mike Hayhurst rides and helps map the beautiful Babacomari River that runs through the ranchlands he has lived on most of his life. Mike takes his grandkids fishing and swimming here, and wants to see it protected for the future. © Holly Richter/TNC
  • Holly Richter, the Conservancy's Upper San Pedro River program director, uses a GPS unit to map a stretch of river, her trusty horse Macky provides the transport. © Holly Richter/TNC
  • Kelly Tighe rides a dry stretch of the Upper San Pedro on her horse Abby. © Holly Richter/TNC
  • Who wouldn't want to spend a day on this river -- even in the driest month of the year -- June? © Tana Kappel/TNC
  • As if on cue, a vermillion flycatcher greeted the mappers. This mapping group also spotted a summer tanager, Bell's vireo, great blue heron, Mexican mallards and the endangered yellow-billed cuckoo. © John Hoffmantillo
  • Ted Mouras, who has mapped the San Pedro River for many years running, reported seeing two gray hawks near their probable nesting locations within the San Pedro Riparian National Conservation Area. © Bob Griffith
  • Standing in Water: Mike Magyar mans the GPS unit while Ken Wiley, the Conservancy's Director of Stewardship, takes notes. They mapped a section of the Lower San Pedro River. © Melissa Magyar/TNC
  • Birding & Mapping: From left are: The Nature Conservancy's Dan Wolgast and Ken Wiley, Tice Supplee of Arizona Audubon, Gerry Brunskill of BHP Copper (which owns the land surrounding this stretch of river), and Mike Magyar, an engineer for David Evans and Associates. © Melissa Magyar/TNC
Cross-Border Adventure
Mapping the San Pedro