From vanilla to barbecue to fruit loops, many male butterflies have a distinct smell, known to scientists as pheromones, used to attract females. These pheromones are produced in specialized scales on the wings and are often wafted over females during courtship by flapping. The smells are often oddly familiar to humans, and Opsiphanes butterflies (as seen here) can leave you desiring a piece of cake after catching one in the Amazon.
