Some species of caterpillar have 4,000 muscles in their body. Compare that to the human muscular system, which is made up of only 639. It’s not unusual for insects to have more muscles than humans; grasshoppers have about 900.
Still, why do caterpillars have so many more muscles? It’s for a unique form of transportation. Caterpillars use all of their muscles to move, but not in the same way that we do. They contract their body muscles, forcing their internal organs forward. When caterpillars move forward, their guts move first, and then their bodies follow. No other animal is known to move like this.
(Sources: 1, 2)
19 Amazing Facts