Britannica Sources used in this answer

Why do moths fly into the wind when following a pheromone trail?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Animals communicate by sending and receiving signals. For example, a mother dingo (Canis lupus dingo) can communicate certain types of information to her pups by using tactile signals conveyed through grooming. — Animal communication Animals communicate by sending and receiving signals. For example, a mother dingo (*Canis lupus dingo*) can communicate certain types of information to her pups by using tactile signals conveyed through grooming.

Moths fly into the wind when following a pheromone trail because they utilize a mechanism known as odor-modulated anemotaxis.1

Under natural conditions, odor molecules do not form a smooth concentration gradient that an animal can simply follow. Instead, wind turbulence disperses pheromones into intermittent "wisps" or bursts. Because a moth cannot reliably navigate by concentration alone, the presence of the pheromone acts as a signal to switch on a behavioral program that uses wind direction as a primary guide to locate the source.1

By orienting themselves into the wind, moths can effectively track the odor to its origin. In many species, this involves a zigzagging flight pattern—similar to a sailboat tacking into the wind—which allows the insect to maintain an upwind trajectory even while drifting sideways due to wind currents. The moth uses visual cues from the ground to adjust its flight and ensure it continues moving toward the source of the pheromone.1