When my parents had chickens they found that everytime they'd use the bug zapper, the chickens would clean up the mess below. Before long my dad was leaving it on every night so that there'd be a big pile of fried bugs for the chickens every morning. They even learned what it sounded like when a bug hit so if we had it on earlier in the evening before they went to roost they'd all come running at the sound of a zap.