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SCIENCE

The Claim

Ducks have a cloaca through which both feces and eggs pass.

Verified by Lenz ·

The Short Version

Authoritative anatomy sources support that ducks have a cloaca, and both feces and eggs pass through it at different times. Some internal structures help keep egg-laying and fecal passage functionally separated, but that does not change the basic fact that both use the cloacal outlet.

Caveats

  • The claim does not mean feces and eggs are expelled simultaneously or through identical internal routing at every moment.
  • Some low-quality sources in the evidence pool are unnecessary; the conclusion rests on veterinary and standard reference sources.
  • Internal cloacal folds and eversion during laying can reduce contamination, but these details do not negate the shared cloacal passage.

The Receipts

  1. Cloaca: All About How Birds Pee, Poop, Lay Eggs And Have Sex

    What Birds Are In My Backyard

  2. Bird Terms: Cloaca and Cloacal Kiss Explained

    Birdorable

  3. Cloaca

    ScienceDirect

  4. Gander - an overview

    ScienceDirect

  5. Cloaca | Mammals, Birds, Reptiles

    Encyclopaedia Britannica

  6. Digestive system

    PoultryHub

  7. Where Do Eggs Come Out of a Chicken?

    Kingsley

  8. Chickens Mating: A Look at Roosters and Hens

    Nutrena World

  9. How Do Birds Lay Eggs: An Overall Guide

    Chewy

  10. Cloaca

    Wikipedia

+ 15 more sources — see the full list on Lenz

Filed Under

CloacaDucks

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