The Color of Distance — Amy Thomson

Juna is the sole survivor of a team of surveyors marooned in the dense and isolated Tendu rain forest, an uninhabitable world for humans. Her only hope for survival is total transformation--and terrifying assimilation--into the amphibian Tendu species. Now she speaks as they speak. She fears what they fear. And in surviving as they survive, Juno will come to fathom more about her own human nature than ever before...