Eggs
Depending on the species, 200 to 1,500 eggs are laid on the host plant, which usually serves as the major food source for the caterpillars. Most eggs hatch within a few days.
Larvae
The larva emerges from the egg and feeds on the host plant, molting its skin repeatedly as it grows. Some swallowtail species require specific plants or plant parts, while others are more adaptable.
Pupa
When ready to pupate, the caterpillar produces silk thread and attaches itself to a sheltered object. It remains motionless while the pupa, or cocoon, forms.
Metamorphosis
Biological changes occur within the cocoon, transforming the caterpillar into a butterfly.
Emergence
The butterfly emerges with tightly folded wings, and remains still for several hours while the wings expand and stiffen. When the wings are fully open and the body skin hardens, the new butterfly takes flight.