Mapping the Great Migration
Twice a year, billions of birds undertake one of nature's most extraordinary journeys — flying thousands of miles between breeding and wintering grounds along ancient aerial highways. BirdMapper brings these invisible pathways to life through interactive maps, real-time tracking data, and species-by-species migration profiles.
How Migration Mapping Works
Modern bird migration mapping combines multiple data sources into a unified picture of avian movement:
- eBird observations — Millions of citizen science sightings reported by birders worldwide, providing real-time distribution data
- Weather radar (BirdCast) — Doppler radar stations detect large nocturnal migration events, estimating the number and direction of birds in flight
- Satellite tracking — GPS and Argos transmitters attached to individual birds provide precise route and stopover data
- Geolocators — Lightweight light-level loggers that record sunrise and sunset times to estimate daily position
Featured Migration Routes
Atlantic Flyway
The eastern corridor stretching from Arctic Canada through the Appalachian Mountains and Atlantic coast to the Caribbean and South America. Key species: warblers, shorebirds, raptors.
Mississippi Flyway
The central superhighway following the Mississippi River valley. The broadest flyway, funneling birds from the boreal forests of Canada to the Gulf Coast and Central America. Key species: waterfowl, sparrows, thrushes.
Pacific Flyway
The western route from Alaska and the Pacific Northwest to coastal California, Mexico, and beyond. Key species: shorebirds, hummingbirds, raptors, waterfowl.
Notable Migrators
| Species | Distance | Route Highlights |
|---|---|---|
| Arctic Tern | 44,000 miles/year | Pole to pole — the longest migration of any animal |
| Bar-tailed Godwit | 7,000 miles nonstop | Alaska to New Zealand without rest |
| Ruby-throated Hummingbird | 500 miles over water | Crosses the Gulf of Mexico nonstop |
| Swainson's Hawk | 6,000 miles | Western U.S. to Argentine pampas |
| Blackpoll Warbler | 1,500 miles over ocean | New England to northern South America |
How You Can Help
Bird migration faces growing threats from habitat loss, light pollution, climate disruption, and collisions with buildings and communication towers. Here is how you can make a difference:
- Report sightings on eBird — Every observation contributes to the migration data that scientists and conservationists rely on
- Reduce light pollution — Turn off unnecessary outdoor lights during peak migration, especially in spring and fall
- Make windows bird-safe — Window strikes kill hundreds of millions of birds annually — UV-reflective films and patterned glass save lives
- Support habitat conservation — Donate to or volunteer with organizations protecting critical stopover sites
- Plant native species — Native plants provide the insects and berries that fuel migrating birds
Why Migration Matters
- Ecological indicator — Changes in migration timing and routes signal broader environmental shifts
- Pest control — Migratory birds consume billions of insects, providing billions of dollars in agricultural pest control
- Seed dispersal — Birds distribute seeds across vast distances, maintaining plant diversity
- Cultural heritage — Human civilizations have marked seasons by bird migration for thousands of years
Follow the birds. Explore our interactive migration maps and discover the journeys happening above you right now.