Birds migrate by inherited programs, fat fueling and multi-cue navigation — but no complete species-by-species route list exists

The question asked: “How do birds migrate? List all species and their routes.” The candid answer: an exhaustive route list for all birds cannot be produced responsibly. There are more than 10,000 living bird species; migration is often partial or facultative; populations — even individuals — of one species take different routes; routes shift by season and year; and the best global products cover only subsets. The largest global effort, the 2025 eBird Status update, models 2,974 species — well short of every bird, and a model of abundance, not an individual track.

Evidence below: 9 named flyways and corridors, 4 illustrative tracked species routes, and coverage figures from Cornell, eBird, Audubon, Smithsonian, USGS and Movebank pages, gathered 2026-08-30.

Flyways are broad shared corridors — the four example routes below are illustrations, not a list

documented example route (4 species, hover for detail)named flyway corridor — a wide region used by many populations, never a single line

What the coverage evidence says

Birds of the World holds behavioral accounts for over 10,000 species — an encyclopedia of how each migrates, not an all-species route atlas — academy.allaboutbirds.org

Audubon's Bird Migration Explorer maps 458 migratory species that regularly occur in the United States and Canada — a hemispheric, not global, scope — explorer.audubon.org

Cornell's eBird weekly abundance animations show migratory pathways for over 1,000 species; the 2025 Status update extends products to 2,974 species globally — still modeled abundance, not exact individual tracks — academy.allaboutbirds.org · ebird.org

Cornell counts more than 300 North American species as long-distance migrants, triggered by changes in day length, temperature and food supplies — allaboutbirds.org

BirdLife's African–Eurasian Flyway stretches from the Arctic to the southern tip of Africa — one corridor spanning two continents and dozens of countries — birdlife.org

How migration works

Timing and triggers

Departure is cued by changes in day length, temperature and food supplies, with hormonal shifts and genetic predisposition. Shortening days trigger migratory restlessness (Zugunruhe). Obligate migrants leave on hard-wired schedules regardless of local weather; facultative migrants adjust to conditions — allaboutbirds.org · audubon.org

Fueling and flight

Birds accumulate fat and remodel physiology and behavior before departure — restlessness, late-day foraging and weight gain power the journey. They travel by powered flapping flight, soaring on thermals and updrafts, dynamic soaring over oceans, and often in flocks, pausing at stopovers to refuel — nationalzoo.si.edu · academy.allaboutbirds.org

Navigation

Orientation is a redundant, multi-cue system: inherited compass programs refined by learned experience, the sun and polarized light, the stars, Earth's magnetic field, landmarks, odors, and possibly sound. Routes often follow coastlines and landmasses — academy.allaboutbirds.org

Route variability

Migration comes in many forms — obligate, facultative, partial (only some individuals move), altitudinal (up and down mountains), nomadic (tracking food), molt migration (to a safe molting site), and loop migration (different outbound and return paths, like the Pacific flyway's figure-of-eight). One species can hold several of these at once — discovery.ucl.ac.uk

Why all species cannot be listed

Over 10,000 living bird species exist; no product tracks routes for all of them.
Migration is often partial or facultative — within one species, some populations move and others stay.
Different populations and individuals of one species use different routes, and routes change by season and year.
The largest global coverage — eBird's 2,974 modeled species in 2025 — is under a third of all species, and models abundance, not individual tracks.
Flyway naming schemes overlap and compete; the 9 corridors shown here come from mixed sources and are not a canonical list.

Where to look up a species

Resource	Stated coverage	What it gives you	Source
Birds of the World	over 10,000 species	Behavioral accounts: dispersal, timing, routes, orientation, flocking	academy.allaboutbirds.org
eBird Status and Trends	2,974 species globally (2025); animations for 1,000+	Weekly modeled abundance animations showing pathways	ebird.org
Audubon Bird Migration Explorer	458 species (U.S. and Canada regulars)	Species migration maps across the hemisphere	explorer.audubon.org
Movebank	study-by-study tracking collections	Individual animal tracks, e.g. 43 Swainson's hawks North America–Argentina	movebank.org

Together these still do not make a complete route list for every species.

The rows behind the map

Flyway or example species	Geography or route	Pages	Source

Method: broad web scan on 2026-08-30 across thousands of search results from authoritative (Cornell, eBird, Audubon, Smithsonian, USGS, Movebank, BirdLife) and secondary sources; 100 coverage-and-timing pages reviewed (15 with extractable facts), 9 named flyways or corridors, 4 illustrative species routes, 10 primary-organization pages. A "species covered" figure counts species with any product on that platform, not verified individual routes. Route lines on the map are schematic great-circle sketches between stated origin, corridor and destination; two species-route sources are secondary and their details are indicative only. Rows without extractable facts were cut for space.

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