Cephonodes kingii, SPHINGIDAE,
with white spiracles outlined in red along its sides
On each side of each segment
there is an oval opening called the spiracle.
All the spiracles on one side leads in to a single branching tube,
the trachea, that delivers air to all of the segments.
The Caterpillar does not actually breath, but the
compression and extension of each segemnt as the Caterpillar moves
causes the air to go in and out of the spiracles
so that oxygen can be taken in, and carbon dioxide
(updated 5 March 2007)