“Rocky Mountain Arsenal National Wildlife Refuge, just outside of Denver, Colorado, is a remarkable place to photograph grassland species like bison, prairie dogs, black-footed ferrets, raptors, coyotes, meadowlarks and variety of songbirds,” photographer Emma Balunek observes. “I visited one morning after a fresh snow hoping to make wildlife images and found a group of bison roaming and sticking their heads through the foot of snow to reach the vegetation beneath. “As the bison began to take a rest, a black-billed magpie flew into the herd and started searching for insects on this bison’s face. The bird was quite chatty, squawking in the bison’s ear. The bison shook its head in an attempt to get the magpie off, but it always returned,...