Meet Narwhal, a dog with an extra tail growing from his forehead. He was rescued by a pet shelter in Missouri last fall. The puppy is named after a type of horned whale known as the “unicorn of the sea.” The staff at the shelter say Narwhal’s spare tail is harmless and doesn’t cause the pup any pain. (And in case you’re wondering, no, he can’t wag it!)

Photos of Narwhal have made him an internet celebrity. More than 300 people have asked to adopt him. But the shelter plans to keep its unicorn puppy, to help remind people that it’s OK to be unusual.