includes eight holding Cornell faculty appointments. Citizen science Collecting the observations of everyday birders for scientific use is a hallmark of the Lab. Bird watchers of all ages and skill levels help gather the data needed to capture the big picture about the distribution and abundance of birds. Nearly 600,000 people participate in the Lab's projects. The eBird database allows birders to track any of the earth's 10,585 bird species to a single scientific database. As of October 2020, almost 47.7 million checklists have been recorded, including observations of 10,511 species. The Cornell Lab's citizen-science projects take place in all seasons and include Project FeederWatch, NestWatch, Celebrate Urban Birds, Birds in Forested Landscapes, CamClickr, and two projects in partnership with the National Audubon Society: eBird and the Great (Global) Backyard Bird Count. The Cornell Lab operates many NestCams which capture live video of nesting birds in the spring. The Cornell Lab publishes the free Merlin Bird ID app for iOS and Android devices. This field guide and identification app guides users to put a name to the birds they see, and covers 3,000 species of across the Americas, Western Europe, and India. In addition to browsing customized lists of birds for any location in the world, users can answer simple questions to get a list of most likely species, along with images and sound. In 2017, Merlin Bird ID was updated to include AI-powered automatic photo recognition, which allows quick identification help with photographs. Bird ID and Photo ID require separate file downloads. The app also offers Sound ID, which can identify some 450 North American species, in real time or from an in-app recording, and even if multiple species are communicating at once. The app also displays a basic black-and-white spectrogram - a visual representation of sound. Research Cornell Lab scientists, students, and visiting scholars are carrying on much original research in behavioral ecology, conservation, education, evolutionary biology, information systems, and population genetics. Cornell Lab engineers also develop hardware and software tools used in researching bird and animal communication and patterns of movement. In the Evolutionary Biology laboratory researchers are extracting DNA from living birds or specimens to uncover the relationships among species. In addition to many studies and published papers, the Cornell Lab's Conservation Science Department has produced land managers' guides aimed at conserving dwindling populations of scarlet tanagers, wood thrushes, and other forest birds. The Lab worked