Abstract: Under natural conditions, an organism's environment can be extremely variable depending on the year. This variability can lead to dramatic fluxes in species interactions, including competition and predation. Phenotypic plasticity is the genetic ability of an individual to adapt to these environmental uncertainties within a generation. This study was designed to identify the possible cues of plastic anti-predator phenotypes in the anuran species Hyla versicolor. After a 15 day induction period, the larvae were photographed and several morphological traits were analyzed. The results for this study were not ready at the time of submission, however a second study that arose from unexpected mortality in the plasticity experiment yielded significant and surprising results. Sterilized spring water had a significant negative effect on tadpole survival, especially at higher densities. Biological reasoning for this is unclear at this point, but several ideas are discussed in the text.