Buffalo Fly Trap

Buffalo flies are a serious problem for dairy cattle in tropical and sub-tropical Australia. An individual cow can be bitten by hundreds of these blood sucking insects every day. They cause great discomfort and irritation to the animals, which often injure themselves as they rub against trees and fences in order to scratch the bites.
Pesticides can be used to control the Buffalo fly, but the chemicals are expensive and environmentally unfriendly and the flies are developing resistance to them.
In 1993 the ABC's environmental program, A Question of Survival, featured the work of CSIRO scientists Bob Sutherst and Bob Tozer, who together had perfected a simple and very effective solution.
It took the form of a small translucent plastic tent - looking much like a carwash for cows - and when cattle take a leisurely stroll through it, the flies take flight and head instinctively for the ceiling. It's a flight of no return. They become trapped between the two layers of a false ceiling, where the air, heated by the Sun, is hot and dry. Death from dehydration is inescapable.
The trap requires no chemicals, no labour and has the unexpected design feature that ants quickly take up residence to take care of all of the cleaning.
Some Buffalo fly trap designs can remove up to 90% of the flies from the cattle as they walk through the trap.
(c) Australian Broadcasting Corporation
abc.net.au/science