We provide the first direct observation of intentional herbivory in sirenid salamanders and provide a literature summary that indicates that the phenomenon has been well documented, but often misinterpreted. Here we report direct observation of herbivory in Siren lactertina (Greater Siren) and Pseudobranhcus axanthus (Southern Dwarf Siren) and review indirect evidence of the same for S. intermedia (Lesser Siren). We believe that at least two species of sirenid salamanders are facultative herbivores, the only salamanders known to show such behavior, and this behavior may apply to all known species of Sirenidae.