This behavior, I later learned, is known as a “caterpillar train.”
What Is a Caterpillar Train?
This fascinating behavior is often seen in species like the pine processionary caterpillar, known for their habit of moving in tight, single-file lines. It’s not just a curious quirk—it’s a brilliant survival strategy.
Here’s why they do it:
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Protection in numbers: A long, moving line makes the group appear larger and more intimidating to predators.
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Navigation through teamwork: The leading caterpillars lay down a trail of pheromones—chemical signals that guide the others.
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Group cohesion: Following this scent trail helps the caterpillars stay together and move as one, reducing the chances of stragglers getting lost.
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