This map depicts the seasonally-averaged estimated relative abundance, defined as the expected count on an eBird Traveling Count starting at the optimal time of day with the optimal search duration and distance that maximizes detection of that species in a region.
eBird data from 2014-2018. Estimated for 2018.
Fink, D., T. Auer, A. Johnston, M. Strimas-Mackey, O. Robinson, S. Ligocki, B. Petersen, M. Iliff, and S. Kelling. eBird Status and Trends. Version: November 2019. https://ebird.org/science/status-and-trends. Cornell Lab of Ornithology, Ithaca, New York.