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Why they move this way:
- Protection from predators: a large moving group can look intimidating or confusing to birds and insects.
- Following silk or scent trails: the front caterpillars leave a trail the others follow.
- Searching for food or a safe place to pupate: they may be migrating from a tree to soil where they’ll transform into moths.
- Energy efficiency: moving in a line may help them conserve effort.
The “rope” illusion is very common because the caterpillars stay tightly packed and move in sync.
One important thing:
Some processionary caterpillars have tiny irritating hairs that can cause:
- skin rashes,
- itching,
- eye irritation,
- or breathing problems in sensitive people and pets.
So it’s best not to touch them with bare hands, and keep pets away if you see them again.
Nature can produce some really strange group behaviors — and a moving caterpillar “snake” is definitely one of the creepiest surprises people find in their yards.
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