Effective methods to repel birds include the use of decoys or scary masks, placing spikes or netting in areas where the birds congregate and the use of irritating noses, smells or lights. Other methods include bringing in a sheepdog, hawk or falcon to scare the birds away.
Devices are available that are harmless but act as bird repellents, including mechanical devices that rotate wires or propellers, motion-activated water blasters and mild electric zappers that shock but do not hurt the birds. Other available gadgets include sound machines and strobe lights that irritate birds. The application of reflective material can confuse birds and keep them from landing in a particular area.