Dots scale with population, compressed. Each dot stands for many birds.
Simulated from eBird reports (GBIF). Counts: Partners in Flight, USFWS, BirdLife, Audubon. Arctic Tern count is worldwide and Red Knot is one subspecies. Fork-tailed Flycatcher and White-crested Elaenia counts unknown, dots assumed. Imagery: NASA. Borders and lakes: Natural Earth. Concept after Aaron J. Becker, mapped.earth.