How did angelfish get their name?

Tiger Swallowtail butterflies have stripes on their wings that resemble the stripes of a tiger. The swallowtail part of their name comes from the two "tails" they possess; one on each wing. Many people thought and think that the tails resemble the tails of certain species of swallow, which is a type of bird. Thus the name Tiger Swallowtail butterfly.