Bird Stop by Bird-X is a food-grade taste aversion liquid bird repellent that tastes bad to birds and irritates birds' sensory systems (similar to our sense of smell). Applying the bird repellent spray directly to surfaces will create a safe and effective deterrent to pest birds. The active ingredient (methyl anthranilate) has a taste and smell that birds avoid. Liquid can be painted or sprayed onto surfaces such as grass, turf, crops and structures. Often, a single application brings permanent success after 2 to 3 applications, even stubborn birds learn not to return. Single gallon treats up to 1 acre. Repel pest birds such as geese, ducks, seagulls and other waterbirds, as well as pigeons, sparrows, starlings, barn swallows, etc.