They aren't attractive and they have spike-like tufts. I think they are probably nocturnal like their adults too.
Explanation: The early caterpillars are yellowish and gray with sparse tufts of black hair; each abdominal segment with round black dorsolateral spot on each side of midline; later caterpillars are densely hairy black and brown
Camouflage(blend into their surroundings extraordinarily well. Many are a shade of green that matches their host plant. Others look inedible objects, like bird droppings (the young Tiger Swallowtail larva).
tiger swallowtail larva)
Addition**
The Tiger Swallowtail caterpillar has large eyespots.Eyespots (rubby tiger caterpillars have eyespots that make them look like a bigger, more dangerous animal, like a snake). An eye***spot is a circular, eye-like marking found on the body of some caterpill
Second Addition***
Bad smells Some caterpillars can emit very bad smells to ward off predators. They have an osmeterium, an orange, y-shaped gland on their neck which gives off a strong, unpleasant odor when the caterpillar is threatened
