Livebearers

Rarity: Common

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Science and technology

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What Wikipedia says

Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young, a process known as frying. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppy, molly, platy, endler’s and swordtails.

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

Image: Nevit Dilmen (talk), CC BY-SA 3.0, via Wikimedia Commons.