Tadpoles of Cope's Gray Treefrog, Hyla chrysoscelis, were reared in the presence of two concentrations of colloidal clay to evaluate the influence of clay-associated, organic materials on growth. There were no dose-dependent effects of the amount of clay, but total tadpole lengths were 14.1 and 12.1% larger than clear-water controls for low and high clay content treatments, respectively. Similarly, tadpole wet masses were 35.1 (low clay) and 38.5% (high clay) larger than controls. Organic molecules and small organisms are sequestered on the enormous, collective surface area of the negatively charged clay particles, and we attribute the increased growth performances to these potential food sources.