Some moths form cocoons by wrapping leaves around themselves and gluing them together with silk. Very few butterflies make cocoons, but the butterfly pupa, called a chrysalis, is usually suspended by a silk thread, and its integument is often sculptured and brightly colored. The chrysalis of the monarch butterfly is soft green with gold spots. A few insects, e.g., the mosquito , have active pupae. The duration of the pupa stage varies in different insects from a few days to several months.
Many insects pass the winter in the pupa stage, and the imago emerges in the spring.
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