Communication and Pheromones
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Animal communication transmits information between a signaler and a receiver, often through a pheromone, a chemical released to trigger a response in another individual of the same species.
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A foraging ant lays a pheromone trail other ants follow directly to a food source.
Watch for
A pheromone signals within a species — a chemical cue read by a different species is not a pheromone.