Description: English: Deep in the U.S. Bureau of Land Management's Riverside East Solar Energy Zone, a blue palo verde tree towers over a University of Vermont-made solar-powered acoustic monitoring unit that records bird songs to gain insights on how wildlife are responding to utility-scale solar energy. Date: 28 March 2017, 10:57. Source: Balantic_000484_166345_510917_4578. Author: Photo by Cathleen Balantic. – U.S. Department of Energy from United States.