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the claim

All birds produce milk for their young.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 4 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 all birds produce milk for their young?

Unclear. Several sources indicate that a milky crop secretion is produced only by some birds, such as pigeons, doves, flamingos and some penguins, and that birds generally nourish young via yolk-filled eggs. None of the placed items directly states that not all birds produce milk, so they only partially bear against the universal claim.

Verdict: PARTIAL LEAN · 0 sources for, 4 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 · 4
Pigeon Milk Is a Nutritious Treat for Chicks | Audubon
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Pigeon Milk Is a Nutritious Treat for Chicks | Audubon. (n.d.). audubon.org. https://www.audubon.org/news/pigeon-milk-nutritious-treat-chicks

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More against · 3
For Mammals, Loss of Yolk and Gain of Milk Went Hand in Hand
2008
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For Mammals, Loss of Yolk and Gain of Milk Went Hand in Hand. (2008). doi.org. https://doi.org/10.1371/journal.pbio.0060077

Effects of chronic lead ingestion on reproductive characteristics of ringed turtle doves Streptopelia risoria and on tissue lead concentrations of adults and their progeny
1981
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Effects of chronic lead ingestion on reproductive characteristics of ringed turtle doves Streptopelia risoria and on tissue lead concentrations of adults and their progeny. (1981). doi.org. https://doi.org/10.1016/0143-1471(81)90006-4

Crop milk - Wikipedia
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Crop milk - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Crop_milk

Receipt History
held for human review18 Oct 2026
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