 The calls made by caecilians and salamanders are limited to occasional soft squeaks , grunts or hisses and have not been much studied . A clicking sound sometimes produced by caecilians may be a means of orientation , as in bats , or a form of communication . Most salamanders are considered voiceless , but the California giant salamander ( Dicamptodon <unk> ) has vocal cords and can produce a rattling or barking sound . Some species of salamander emit a quiet squeak or yelp if attacked . 
