Synsacrum

Rarity: Common

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At a glance

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Notion

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Science and technology

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What Wikipedia says

The synsacrum is a skeletal structure of birds and other dinosaurs, pterosaurs, as well as xenarthran mammals, in which the sacrum is extended by incorporation of additional fused or partially fused caudal or lumbar vertebrae.

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

Image: derivative work: Jack · talk · Bréchet.png: toony & svtiste, CC BY-SA 3.0, via Wikimedia Commons.