Bird-Off Gel is the original and first bio repellent gel. It is used to prevent pigeons and other large birds from roosting and congregating in unwanted areas. Unlike other bird repellent gels which are made from polybutene, Bird-Off Gel is an oil based with white peper bird repellent gel. It's nontoxic and doesn't harm the bird, even if the birds come in contact with Bird-Off Gel they can still fly or walk. They will not be trapped on the treated surface.