Image: Close up of a maggot spiracle A close up of one spiracle
(breathing apparatus) of a fly maggot. Electron micrograph. - S.
Lindsay - © Australian Museum The rear ends of maggots (fly
larvae) consist of a chamber, in which their anus and posterior
spiracles are located. (They also have anterior spiracles).
Spiracles are used for breathing, and the possession of
spiracles in a posterior location means that maggots can breath
feeding 24 hours a day.