March through May is peak calving season for bison. Calves are born sporting an unmistakable red-orange fur coat, earning them the nickname “red dogs.” It takes several months before young bison begin brandishing their characteristic dark brown coloration, horns, and shoulder hump. In the meanwhile, calves remain under the close protection of their watchful mothers. This Mother’s Day, learn about other hard-working wildlife moms across the United States and discover 14 more fascinating facts about America’s National Mammal.
