Stuff You Should Know Caterpillars: Nature's Magicians
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Mar 20, 2026 Tiny eating machines take center stage. The conversation roams through extra legs, silk tricks, camouflage, stinging hairs, and even meat-eating species. There is poop-flinging defense, tent-building teamwork, and the wild body makeover from larva to moth or butterfly. It also touches on garden chaos, dangerous species, and pest-control debates.
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Caterpillars Are Built As Pure Eating Machines
- A caterpillar is the larval stage of the same butterfly or moth, built almost entirely to eat, poop, molt, and store energy.
- They can eat 27 times their body size, grow about 100 times larger, and one study suggested adults still avoid smells learned as late-stage caterpillars.
How Caterpillar Bodies Work Without Bones
- Caterpillars only have six true jointed legs; the rest are prolegs with tiny hooks that grip surfaces as waves of muscle move the body.
- They have about 4,000 muscles, semicircle-arranged stemmata that mostly detect light and dark, and spiracles that send oxygen directly to tissue.
Childhood Lessons From Touching Caterpillars
- Josh and Charles Bryant recall childhood encounters with hairy caterpillars and the hard lesson that touching some species can hurt immediately.
- Josh remembers touching one as a kid and reacting, "oh, my God, what just happened," while Charles let one crawl onto his hand from the ground.