Mid-April brings a burst of wildflowers, choruses of frogs and also– baby bison! Nicknamed “red dogs” for the reddish color of their coat, bison calves can weigh anywhere from 30-70 pounds when they’re first born. This time of year offers plenty of tasty prairie plants for the growing calves. Rocky Mountain Arsenal National Wildlife Refuge in Colorado is a short drive from downtown Denver and provides a great place to watch our national mammal roam. Photo by U.S. Fish and Wildlife Service.