Like many other frogs, the male Papua wrinkled ground frog attracts a mate using a loud vocal call. AMNH researcher Richard Zweifel recorded the call of this species during one of four major surveys he conducted in Papua New Guinea. He has now described more than 50 new frog species to science. Different frog species may look very much alike, but herpetologists can analyze recordings of the calls to tell one species from another, since each has a unique call. In fact, even closely related species can have vastly different calls. Only males call; females in turn choose their mate based on a call's quality.