They are permanent ectoparasites, feeding on the host. The female fly produce a single larvae at a time, and the larvae are held back until they are ready to pupate. The larvae undergo three larval stages before becoming fully developed. Pupation of the larvae occurs, and they are clearly seen on the fleeces of the sheep. These then later emerge as adults. | They are permanent ectoparasites, feeding on the host. The female fly produce a single larvae at a time, and the larvae are held back until they are ready to pupate. The larvae undergo three larval stages before becoming fully developed. Pupation of the larvae occurs, and they are clearly seen on the fleeces of the sheep. These then later emerge as adults. |