摘要：Behind the brick walls of the National Wildlife HealthCenter, past security doors leading to an isolation room,black-tailed prairie dogs dine on peanut-butter-flavoredpellets. These tan-colored rodents with black-tipped tailswere captured near Wall, South Dakota, and now live inburrows of stainless steel boxes connected by plasticpipes. Normally, they would be eating alfalfa pellets,carrots and broccoli. But on this summer day in Madison,Wisconsin, the only thing on the menu is peanut buttersnacks, served up by the center’s scientists.
