In what’s one the more amazing displays of animal mimicry I’ve ever seen, the larva of the Elephant Hawk-Moth has the ability to fool predators into thinking it’s a snake. From Wikipedia:
“When startled, the caterpillar draws its trunk into its foremost body segment. This posture resembles a snake with a large head and four large eye-like patches. Caterpillars are preyed upon by birds, but these shy away (at least for some time) from caterpillars in “snake” pose.”
A user on Reddit posted the below montage to give you a better idea of the resemblance between the caterpillar and its reptilian counterpart.