sentence: All caterpillars can make silk.
sentences_after: The silk is made from the salivary glands. Silk starts out as a liquid in the salivary glands. The caterpillar draws out the silk into a small thread. The silk hardens as soon as it is exposed to the air. Caterpillars use silk to make nests or cocoons.
concept_name: caterpillar
headings: Butterfly Life cycle Caterpillar