Web-Slinging Caterpillars

Newly hatched warty birch caterpillars (each smaller than a sesame seed) defend the tips of the leaves they live on by vibrating ferociously. They drum their heads, shake their bodies, and scrape their rear ends against the leaf, sending strong vibratory signals to scare off intruders. If the vibrations don’t work, the caterpillar swings away on a silk thread much like a spider.

Their defensive behavior—vibrational signaling—is silent to our ears but effective in the caterpillar world. Scientists believe this could open a window into unseen communication methods among tiny organisms.

The territorial little caterpillar needs a home where it can eat, cocoon, and metamorphize. Its communicative skills and web-slinging action are testaments of God’s careful provision even in the tiniest critters of his creation.

This article is from Answers magazine, October–December, 2025, p. 18.