Come along with Chris and Martin as they encounter some of the challenges of a butterfly's journey south for the winter, including predators and the need for lots of energy. Viewers learn that butterflies use a zig-zagged flight pattern defense to keep away from predators like the Tree Swallow. They also learn that the butterflies must take breaks to refuel and use a special tube-like part of their body — the proboscis — to suck up nectar from flowers.