Put an end to large-scale infestations with these TERRO outdoor liquid ant baits. Their pre-filled, ready-to-use design is convenient and easy to install around your home or yard where ants have been observed. Each station contains 1 ounce of liquid formula, ensuring foraging worker ants share the bait with the entire colony, letting you exterminate the problem at the source. Unlike contact killers, which only target visible worker ants on your property, these baits include slow-acting ingredients that have a delayed effect on the ant's digestive system. This deliberate kill method lets the foragers feed and return to the colony where they can spread the bait to the young and queen, eliminating the outdoor population before it can enter your home. During this time, the number of ants may increase as they swarm to feed on the sweetened liquid before they begin disappearing altogether. The patented bait stations feature a foil seal that prevents the liquid from drying prior to placement. This prefilled design lets you prepare the bait and fill the internal reservoir in seconds by simply pushing the cup down and giving it a quarter turn, which punctures the foil. Ants access the bait through holes at the top of the ramps. Created for flexibility, these bait stations can be set flat inside garages, sheds and deck spaces or outdoor grass or gravel-covered locations. Argentine ants, ghost ants, cornfield ants, pavement ants, acrobat ants, white footed ants, little black ants, odorous house ants, crazy ants, big headed ants and other sweet ants (except fire ants, pharaoh ants, carpenter ants and harvester ants).