The Duck's Helix

Muscovy ducks mid-copulation in Don Det, Laos, and a duck lake under duckweed in Akademgorodok

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— You know what the duck’s dick looks like, don’t you?

The corkscrew

Domesticated Muscovy ducks (Cairina moschata), mid-copulation in Don Det, Laos.

Two copulating ducks, the drake's corkscrew phallus visible
Two copulating ducks, the drake's corkscrew phallus visible

CC BY-SA 4.0 · Basile Morin · Wikimedia Commons · licence

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The lemna

Mallards occupy birchleaf-ridden Tulubaika and swim in uneven spirals, quacking, feasting on food provided by the audience or on lemna if the audience is absent.

Duckweed.

Ducks sitting on a lake covered in duckweed, Akademgorodok, Novosibirsk
Ducks sitting on a lake covered in duckweed, Akademgorodok, Novosibirsk

Duck lake, Akademgorodok, Novosibirsk

CC0 · Pather Alexiy · Wikimedia Commons · licence