To protect these animals and their mustelid predator, Tonie Rocke led a three-year field trial that targeted these animals with peanut butter-flavored bait. An oral vaccine for these animals expresses the F1 and V307 antigens using a raccoon poxvirus vector. Con Slobodchikoff discovered referential specificity in the communication of these animals. The black-footed ferret (15[1])is nicknamed for hunting these animals, which caused a 2003 (*) mpox outbreak. Keystone species of these animals include one named for Gunnison and another named for its black tail. These fossorial animals do the jump-yip to bark out a “chee-chee” alarm call on their hind legs. These mammals create mounds that renew topsoil as a byproduct of digging their extensive tunnel systems. For 10 points, name these burrowing rodents named for a type of grassland. ■END■