Heliconius butterflies choose to lay eggs on the leave of passionflower vines. When the eggs hatch, the offspring feed hungrily on the leaves, threatening to eat the vines out of existence. But the vines have learned to fight back; they have evolved a series of defenses to limit the damage.
Day after day the passionflower vine and the handsome heliconius butterfly engage each other in a dramatic fight for survival in the tropical forests of Central and South America. The outcome is still uncertain, but the battle rages on.