Antheraea polyphemus, wild silk moth, male, dried specimen. Female wild silk moths produce a chemical pheromone which attracts male moths for mating. Males can find females up to 4.5 kilometres away. Their antennae are very sensitive, with hair-like receptors that respond to a single molecule of pheromone. To make sure that they do not miss a female’s attractive perfume, the antennae are shaped like feathers to maximize the surface area.