Whether they are biting your horses or your children in the pool, they are delivering a very painful bite. Until the HORSE PAL® there had been no commercially available way to effectively reduce their numbers. Insecticides don't work. These flies are strong fliers. As soon as the insecticide settles down, new flies arrive and the problem is renewed. The HORSE PAL® biting fly trap is constantly on duty, attracting the biting flies in the area and capturing them. The trap is environmentally sound. It requires no smelly or messy baits. The only care required is occasionally removing the capture bottle and dumping out dead flies.