sentence: Older caterpillars have two different color forms.
sentences_before: They are sometimes laid on the tree trunks. The egg is pale green. After three days it turns an orange-brown color. It turns dark gray just before hatching. Young caterpillars are black.
sentences_after: The more common form is green. It has yellow and white stripes. The more rare form is black with white and orange stripes. The caterpillar has a bad smelling, forked gland called an osmeterium. It is found just behind the head.
concept_name: older caterpillar
headings: Eurytides marcellus Life cycle