This video from DragonflyTV follows two sisters as they examine the incidence of, and possible explanations for, malformations in a local frog population. The girls explain how frogs develop from tadpoles and how the animals are sensitive to changes in the environment. They also describe research into common types of frog malformations and the likely causes: ultraviolet rays from the Sun, chemicals, and parasites. The girls then organize a field study to collect a sample of frogs to determine which type of malformation is most common in the pond near where they live. Based on their findings, they conclude that parasites are the probable culprit.