Red admiral butterflies fly in a highly irregular fashion, constantly varying their speed, wing strokes, and flight path. While predators avoid poisonous butterfly species, nonpoisonous butterflies like the red admiral need to elude predators to survive. Scientists ttherefore hypothesize that the red admiral' s flight style, which is clearly not energy efficient, evolved as a means of avoiding predators.
 It is much more energy efficient for butterflies to fly in an irregular fashion than it is for heavier varieties of insects most strengthens the support for the scientists' hypothesis.