The name refers to the caterpillar stage larva of any species belonging to the order Lepidoptera . We all look in wonder butterflies fragile and beautiful colored or moths that fluttered gracefully through the air, but you should not forget that prior development of these wonderful creatures can be as exciting , even if the shape of caterpillars them is sometimes frightening . In any case you must be very careful and reluctant to touch them , because some of them are protected with substances that can be very dangerous to humans.