White-tailed birds are a group of birds that are characterized by their long, white tail feathers. The two most common species of white-tailed birds are the Erns and Ernes. The Erns is a small bird found in Europe, Asia, and North America, while the Ernes is a larger bird found mainly in North America. Both species have a white tail with black markings, and they are known for their distinctive call. They are also known to be very social and often form large flocks.