To succeed in mating, many male frogs sit in one place and call to their potential mates. But this raises an important question familiar to anyone trying to listen to someone talking at a busy cocktail party: how does a female hear and then find a choice male of her own species among all the irrelevant background noise, including the sound of other frog species? Now, researchers reporting March 4 in the journal Current Biology have found that they do it thanks to a set of lungs that, when inflated, reduce their eardrum's sensitivity to environmental noise in a specific frequency range, making it easier to zero in on the calls of their mates.