A Startling Discovery in the Grass: When Nature Surprises Us

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:

• Protection in numbers: A long, moving line makes the group appear larger and more intimidating to predators.

• Navigation through teamwork: The leading caterpillars lay down a trail of pheromones—chemical signals that guide the others.

• 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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