How do some animals communicate using pheromones?

Many animals use pheromones—chemical signals that influence the behaviour of other individuals of the same species. Pheromones can be used to mark territory, attract mates, warn of danger, or signal food sources. For example, ants use pheromones to create trails to food, while moths release pheromones to attract mates from long distances. Other animals, such as dogs and cats, use pheromones to communicate territorial boundaries or emotional states to others in their group.