Sergio Avila leads a group of local residents as they set out on a nature walk in the Midvale Park neighborhood in Tucson, Arizona, as part of an effort by local organizations to encourage healthy lifestyles, enjoyment of the outdoors, and a greater sense of community. Roberto (Bear) Guerra/High Country News Wildlife biologist Sergio Avila spent decades working on conservation projects in the U.S.-Mexico Borderlands. Originally from the ecologically diverse desert landscape of Zacatecas, […]