One of the more popular citizen science efforts is the Great Backyard Bird Count, and it is coming up on February 17-20. It is an effort between the Cornell Lab of Ornithology, National Audubon Society, and Birds Canada to help scientists better understand the bird population dynamics and movements. Last year, participants turned in over 350,000 checklists from 192 countries around the world. These observations are helping scientists identify population trends, range expansions or contractions, how birds are doing in urban or rural areas, and more.