Ants 'smell' with their antennae. When they touch each other, when they touch the ground, food sources and other objects, they are, in fact, smelling. Ants operate in a world of smell. They secrete a variety of chemicals and use these chemicals to communicate. These are pheromones, chemicals excreted through glands and perceived externally.
All members of as colony have the same chemical odour, a colony signature.
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