Fly-strike can be a problem for sheep (pictured), poultry and other livestock.
LAWRENCE WRIGHT/FLICKR
Fly-strike, also known as myiasis, happens when a blowfly lays as many as 250 yellowish-to-white eggs in a wound, or in soggy feathers, hair or fur laced with fresh feces. The eggs hatch, becoming maggots in eight to 24 hours. Then they molt twice in three to nine days before dropping to the ground to pupate.