Amphibian declines have been occurring for decades, and some of these declines are attributed to environmental contaminants. In this experiment, we examined the effects of ecologically-relevant concentrations of a common organophosphate insecticide, malathion, on developing Xenopus laevis tadpoles. Two-week-old Xenopus laevis tadpoles were divided into four experimental groups, each with a sample size of ten tadpoles: control (water), 1.0 ng/L malathion, 1.0 μg/L malathion, and 1.0 mg/L malathion. During their 30-day exposure to malathion, tadpoles in the 1.0 mg/L malathion displayed bent tails (p<0.001), unusual swimming behavior, and a higher mortality rate (p<0.001) when compared to the control group. Future experiments should examine the exact etiology of malathion-induced bent tails in Xenopus laevis.