Hungry caterpillars can cause a lot of damage to your precious plants. Your best defense is to scout your landscape on a regular basis. Look over your plants carefully a couple of times a week. If you see chewing damage, try to find the critter responsible. It's probably a caterpillar. Source: Gardening in a Minute, Caterpillars on Ornamentals
Caterpillars are the larval stage of insects in the order Lepidoptera, which includes butterflies and moths.
Forensic entomology is the scientific study of the invasion of the succession pattern of arthropods with their developmental stages of different species found on the decomposed cadavers during legal investigations. [NALT] [AGROVOC]