When a Caterpillar is fully grown,
it turns into a pupa or chrysalis,
often inside a silk cocoon.
This change into a pupa can take several days
during which time it looks dead,
but actually it working hard inside
to begin its change to a moth or butterfly.
The pupal stage may then last anything between a week
and two years depending on the species and conditions.
At the end of that time,
if the pupa has not been damaged or attacked,
the moth or butterfly emerges.
Frequently Asked Questions about Caterpillars
(updated 5 September 2001)