Through eBird, about 180,000 birdwatchers recorded bald eagle sightings, reports Anna M. Phillips for the Los Angeles Times. The USFWS is using the app as a new method to track bird data, where traditionally only surveys were used. It's possible the additional data crowdsourced on eBird partially accounts for the recent surge in population numbers. However, Brian Millsap, the USFWS national raptor coordinator, says that the data estimates line up with other survey data as well, the LA times reports.