Superfetation

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Superfetation (also spelled superfoetation – see fetus) is the simultaneous occurrence of more than one stage of developing offspring in the same animal. This phenomenon is extremely rare in humans, with only 10 confirmed cases until 2008.

Excerpt from the Wikipedia article “Superfetation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia