The cricket--_Phaeophilacris spectrum_--doesn't rub its wings together to call out to others of its species. Doing so might alert predators to its location, and that could seriously undermine an African cave cricket's romantic aspirations. Rather, it repeatedly flings its wings forward to create tiny vortices of pressurized air. Like smoke rings, these bursts of air create a low-pressure region around their edges, causing doughnut-shaped rings to form in the air that can travel fairly long distances. And for the African cave cricket, a few of these rings of air in a row sends a clear message from a male to a female: it's mating time.