Evolution Canyon (image) Virginia Tech Caption The south-facing slope of "Evolution Canyon" is tropical and may receive eight times as much sun, while the north-facing slope is darker, like a European forest. Animals adapt depending on whether they live on the drier, hotter side of the canyon, or the more humid, cooler side. Credit Institute of Evolution, Haifa University Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.