Annual Changes in Hummingbird Migration Revealed by Citizen Naturalists

GarryRogers Nature Conservation

By Victoria.  “Imagine circling the Earth twice on foot while drinking your weight in flower nectar each day. That’s the human equivalent of what Calliope Hummingbirds do, by wing, twice a year, in their migrations between Washington and Mexico.

“Using data from the eBird citizen-science project, researchers patched together hummingbird sightings from more than 300,000 checklists across North America to track the central hub of migration over a five-year period. Based on the number of eBird sightings at different locations, researchers calculated the average location of hummingbird populations for each day. For example, of the estimated 2 million Calliope Hummingbirds in North America, some individuals were recorded by eBird participants during the study period from 2008 to 2013. Researchers used these sightings to then find the average location of all Calliope Hummingbirds each day and visualize overall movement of the species throughout migration” Source:  Cornell Lab of Ornithology.

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