Why Some People Can Smell Ants and Others Cannot

Some people can smell ants, especially when they are disturbed, because ants release smelly chemicals and people differ in how strongly their noses detect them.

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Ants do not all smell the same, and humans do not all detect their scents equally well. Many ant species release chemicals when they are threatened, injured, or crushed. These chemicals can serve as defenses or alarm signals, and some are noticeable to human noses. Formic acid is one familiar example. Some ants use it as a defense, producing a sharp smell that people often compare with vinegar. Other species produce very different odors. Odorous house ants can have a scent compared with blue cheese or rancid coconut, citronella ants can produce a citrus-like odor, and some trap-jaw ants produce a chocolate-like smell when disturbed. Dead ants can also release oleic acid, a chemical associated with olive oil. The surprising part is the difference between people. Human smell receptors vary from person to person, and genetic differences can affect whether someone detects particular chemicals strongly, weakly, or not at all. That means two people standing near the same ants can genuinely have very different experiences of the smell. Ants themselves have an extremely important sense of smell. Their antennae contain chemical receptors that help them communicate through pheromones, including signals associated with trails, danger, and other colony behavior. Humans only notice a small part of this chemical world, but for people who are sensitive to certain ant odors, an ordinary patch of ants can have a surprisingly recognizable scent.

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