As they grow, the caterpillars must be provided with larger quarters, such as wooden boxes with perforated zinc, or netting, sides. A closely fitting glass front has the great advantage of permitting easy observation.
Four or five times during the larval stage the caterpillars will stop feeding and will rest so that they can change. This process may be expected when the heads of the caterpillars appear to be small and protruding. The caterpillars must not be disturbed during the change.
(Large White Larvae)
(Large White Larvae Fully Grown)