Have you ever wondered how those pesky mosquitos always manage to find you in a quiet, dark room? They do so by relying on their sense of smell, much more than on sight or sound. They have amazing odour sensors capable of distinguishing between thousands of different smells which allow them to find their preferred prey by following trails of exhaled carbon dioxide and distinctive body odour. Recently, biologists have discovered that malaria-carrying mosquito possess a specialised set of odour sensors that are tuned specifically to detect humans.