Yes, ants do eat poop. Many ant species are attracted to animal feces, bird droppings, and even urine because these contain nutrients that ants can use. While it might sound unappetizing, coprophagy (the scientific term for eating feces) is a practical survival strategy that helps ants extract proteins, nitrogen, and minerals from sources other animals have discarded.
Why Ants Are Attracted to Feces
Animal waste is not purely “waste” in a biological sense. Feces still contain water, undigested nutrients, vitamins, minerals, and gut microbes. For ants, which are opportunistic foragers that will exploit nearly any available food source, droppings represent a low-effort, nutrient-rich meal. Bird droppings are especially valuable because they’re packed with waste nitrogen, a building block ants need to produce essential amino acids.
Turtle ants, for example, have been observed consuming both mammalian urine and bird feces specifically for their nitrogen content. These ants rely on specialized gut bacteria to recycle that nitrogen into usable protein. The ant absorbs the recycled nitrogen in substantial quantities and converts it into amino acids it couldn’t produce on its own. This partnership between ant and microbe turns what looks like garbage into a genuine nutritional resource.
Which Ants Eat Feces
This behavior isn’t limited to a single species. Western carpenter ants, commonly found in coniferous forests along the west coast of North America, are known to feed on bird droppings, mammal urine, and carrion alongside their more typical diet of aphid honeydew and arthropod prey. Research published in Frontiers in Ecology and Evolution confirmed that carpenter ants are not only willing to eat bird excreta but are actively attracted to its smell from a distance, using wind-borne chemical cues to locate it.
Multiple studies across tropical and temperate regions have documented ants foraging on bird droppings. This appears to be widespread behavior rather than something only a few unusual species do. Any ant species that scavenges for protein, which includes most common household and garden ants, can potentially be drawn to animal feces.
How Ant Colonies Handle Their Own Waste
Ants are meticulous about managing waste inside their own nests. Harvester ants, for instance, maintain dedicated refuse piles called middens on or near their nest mounds. These piles contain seed husks, small debris, and fecal droplets, all carried out of the nest by worker ants. The midden functions as a combination garbage dump and territorial boundary marker.
This sanitation behavior is critical. Keeping feces and rotting material away from the brood (developing larvae and pupae) reduces the risk of fungal infections and bacterial outbreaks that could devastate a colony. Some species designate specific “toilet chambers” inside the nest. Others assign particular workers to waste duty, and those workers rarely interact with the queen or brood. The colony essentially runs its own waste management system.
Ants as Carriers of Bacteria
When ants crawl through feces, whether they’re feeding on it or just passing through, they pick up bacteria on their legs and bodies. A microbiological study examining 50 ants found that 52% carried coliform bacteria, 18% carried E. coli, 8% carried Salmonella, and 6% carried Listeria. Every single ant tested carried yeasts and molds.
More concerning for households: ants that picked up E. coli transferred it to food surfaces 70% of the time. This means ants trailing between outdoor waste and your kitchen counter can deposit harmful bacteria along the way. Ants are considered mechanical vectors of foodborne pathogens precisely because they move freely between contaminated materials like feces and human food preparation areas.
Why Ants Show Up Around Dog Poop
If you’ve noticed ants swarming pet waste in your yard, it’s because dog feces contains undigested proteins, fats, and moisture that ants readily exploit. Fresh waste is especially attractive because it’s moist and nutrient-dense. As it dries out and breaks down, it becomes less appealing, but by then ants may have already established a foraging trail to the area.
The practical fix is straightforward: don’t let waste sit. Scoop your yard at least a few times a week, ideally daily. Place bagged waste in a sealed, lidded trash bin rather than leaving it in an open container. Avoid composting dog poop, as it can carry parasites and will continue attracting insects. If residue remains on the ground after cleanup, enzyme-based products or garden lime can help break down leftover organic material and reduce the odors that draw ants and other pests to the spot.
For persistent ant trails leading to areas where waste has been, a simple disruption of the scent trail (washing the path with soapy water) can redirect foraging workers. Ants navigate by following pheromone trails laid down by scouts, so breaking that chemical roadmap forces them to search elsewhere.