Female lesser short-tailed bats can size up a potential mate just from his singing. A new study in Springer’s journal Behavioral Ecology and Sociobiology shows that the New Zealand bat species Mystacina tuberculata relies on singing as a primary method of courtship, and the complex signals given out by males allow females to assess the physiological suitability of a mate. The research was conducted by Cory Toth of the University of Auckland and Stuart Parsons of the Queensland University of Technology in Australia.