Mountain Chickadee Year-Round High-Elevation Feeders (IMAGE) University of Nevada, Reno Caption The field lab at high elevation is the centerpiece for this study, with two identical metal frameworks - arrays - that hold eight feeders each. Access to the feeders is regulated by RFID activated doors and the feeder arrays can be raised and lowered depending on the snow depth. Credit Vladimir Pravosudov, University of Nevada, Ren. Usage Restrictions None License Licensed content 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.