The Purple Emperor, Apatura iris, is a rare butterfly found only at the tops of oak trees in England. The kind of butterfly from J. Tolkien's The Hobbit, except they were described as a dark dark velvety black variety.
THE BLUE BUTTERFLY. When a little blue butterfly soars in the sky, It’s blue against blue that we see. Although it may vanish, Our hearts know it’s there…. That little blue butterfly, Peaceful and free!