Caterpillars that live in the open have different ways to protect themselves. One of them is the bright color. The ones who do not know that in nature it means “WARNING! DON’T EAT ME” are usually punished for every touch. Many caterpillars secrete a poisonous liquid, which birds and other animals feeding on caterpillars are well familiar with. It can cause eye-, skin- and mucous-membrane inflammation even to human beings.