Anuran amphibians exhibit complex vocal behavior, which is an important mechanism in breeding and species identification . In the past it has been assumed that caudate amphibians are generally silent, with the exception of a few which have been shown to emit faint squeaks and barks. More recent researches have indicated that Cryptobranchidae may be the exception, as having a true voice based on anatomical evidence. To test this hypothesis we studied 4 specimens of the giant Chinese Salamanders, Andrias davidianus , under controlled laboratory conditions. These observations appear to verify both the presence of underwater vocalization and some behaviors associated with it. It is suggested further research under field conditions is warranted.