Some territorial birds vigorously defend their territory. These birds perceive their own reflection in a window to be another bird competing for their mate - and attack. Repeated attacks deplete a bird's energy, putting its health and nesting brood at risk. Stop Bird Attack eliminates the bird's window reflection, calms the birds, and stops the attack. The product is a removable, white coating that may be sprayed on any window under attack. Stop Bird Attack is effective for Northern Cardinals, American Robins, California Towhees, and other territorial birds. (9 ounce aerosol can) Stop Bird Attack cannot be shipped to Alaska, Hawaii, or international destinations including Canada.