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the claim

Migratory birds follow great circle routes between their breeding and wintering grounds.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that migratory birds follow great circle routes between their breeding and wintering grounds?

Unclear. The retrieved items do not directly test whether migratory birds follow great circle routes. One reference notes that migration routes often do not follow the most direct line between breeding and wintering grounds, and two tracking studies document species-specific corridors, but none settles the great circle claim.

Verdict: PARTIAL LEAN · 0 sources for, 2 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 2
Bird migration - Wikipedia
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Bird migration - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Bird_migration

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More against · 1
Migration chronology of Eastern-Population Tundra Swans
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Migration chronology of Eastern-Population Tundra Swans. (n.d.). cir.nii.ac.jp. https://doi.org/10.1139/z03-063

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