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A fannin honeybee exposes Nasonov's gland (white – at tip o abdomen) releasin pheromone tae entice swarm intae an emptie hive

A pheromone (frae Auncient Greek φέρω phero "tae beir" an hormone, frae Auncient Greek ὁρμή "impetus") is a secretit or excretit chemical factor that triggers a social response in members o the same speshies.