Penn Live: Backyard bird feeding sales booming in pandemic. “Downloads of online bird-identification apps are up by orders of magnitude. Two of the most popular apps, the National Audubon Society’s Mobile Bird Guide and Cornell Lab of Ornithology’s Merlin Bird ID, have each been downloaded at more than twice the rate as during the same period last year. Cornell’s bird-logging, citizen-science app, eBird, has seen nearly the same increase in activity this year.”