The scientists were interested in discovering whether the Pacific tree frog population might also be affected by the presence of nonnative trout, similar to the way these trout had affected the mountain yellow-legged frog population. The scientists wanted to compare the populations of Pacific tree frogs with the populations of nonnative trout in John Muir Wilderness (JMW) and Kings Canyon National Park (KCNP). Topics: Wildlife, Frog Metamorphosis, Frogs, Invasive Species, National Park, Nonnative Species, Spanish, Trout.