Confusing the enemy is a great strategy for survival. An effective example of this strategy is called POSTURE REVERSAL. Insects exhibiting posture reversal have markings or appendages or are shaped so that predators are fooled into thinking they will move or fly in the opposite direction. The predator attacks the "head," but the insect has escaped the other way.
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Hairstreaks have bright eyespots and fake antennae on the rear bottom edges of their wings that look like a head. When they land on a flower, they immediately turn in a circle to confuse their predators and bury their real heads into the petals to suck nectar. The orange eyespots and waving fake antennae fool the predator into attacking what it perceives as the head, allowing the butterfly to fly away in the opposite direction.
Having trouble figuring out which end is the caterpillar's head? Imagine the difficulty predators have figuring out where to attack.