Bucas innovation: Fly mask in a zebra print - keeps insects away and blocks UV rays. The horse can see right through it, the sensitive ear area is perfectly protected. Matches the Buzz-Off Riding Zebra. A Bucas Bestseller - not just hot in terms of its good looks! Scientific studies have shown that flies have difficulties targeting zebras due to their blank-and-white coat pattern. With its innovative fly mask, Bucas makes use of the zebra's natural defence system.