The Bird Gard™ Pro is a compact High Fidelity Bird Scarer that will repel and clear starlings, crows and other pest birds from sheds and farm yards or up to 1.5 acres in open ground. Bird Gard™ Surprisingly Inexpensive For EFFECTIVE Control Of: Crows, Rooks, Ravens, and Jackdaws Starlings Pigeons Seagulls / Gulls Sparrows Swallows and House Martins And...