The flies bred happily on dead cows and in sheep which unfortunately were still alive.

Where known these flies breed in sap flowing from trees, examples having been reared from the sap of Araucaria.

Waltzing flies breed in early spring, generally on the carcasses of moose.

But the flies cannot breed in simple, inexpensive pit latrines, Mr. Emerson said.

The flies bred profusely in thousands of inaccessible points.

The sterile flies will breed with the non-sterile ones and after a couple of generations they'll be all gone.

Rats and flies are breeding as never before, adding to critical sanitation and hygiene problems.

There have been several cases where the flies enter homes and breed in the bodies of dead mice, resulting in larger amounts of flies.