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How Do Butterflies and Moths Breathe?

Spiracle; A hole in the side of a butterfly or moth (larva, pupa, and adult) which opens into the trachea.
The trachea takes oxygen directly to the tissue of the insect.
Spiracles can become larger or smaller to control the amount of water loss in the insect. (Wikipedia)
Spiracles are usually football or oval shaped.
Click on the Canna Skipper photo below to see spiracles and trachea tubes through its skin.

Spiracles on an Imperial Moth caterpillar preparing to pupate
Canna Skipper Caterpillar Spiracles Trachea
Hickory Horned Devil Caterpillar Spiracles Regal Moth
Cecropia Caterpillar Spiracles
Spiracles on Imperial Moth Caterpillar
Canna Skipper Caterpillar showing Spiracles and Trachea Tubes
Hickory Horned Devil Spiracles
Cecropia Moth Caterpillar Spiracles
Banded sphinx Moth Caterpillar Spiracles
Polyphemus Moth Larvae Spiracles
Prominent Moth Larva Spiracles
Monarch Butterfly Caterpillar Larva Spiracles
Banded Sphinx Moth Caterpillar Spiracles
Polyphemus Moth Caterpillar Spiracles
Prominent Moth Caterpillar Spiracles
Monarch Butterfly Caterpillar Spiracles
Giant Swallowtail Chrysalis Spiracles
Black Swallowtail Chrysalis Spiracles
Giant Swallowtail Butterfly Spiracles
Promethia Moth Spiracles
Giant Swallowtail Chrysalis Spiracles
Black Swallowtail Chrysalis Spiracles
Giant Swallowtail Butterfly Spiracles
Promethia Moth Adult Spiracles
Monarch Butterfly Spiracles
Cloudless Sulphur Butterfly Spiracles
Monarch Butterfly Spiracles
Cloudless Sulphur Butterfly Spiracles