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Scientists Discover First Swimming Mammal From The Jurassic SECONDARY_TEXT retrieval pending

ScienceDaily · 2006-02-24 · no page hash: the reader saw a rendering, not the bytes · created seq 25935

Link: https://www.sciencedaily.com/releases/2006/02/060224195600.htm · read at 2026-09-29T05:43:00Z · held by reference: only the link, the quoted excerpts with their hashes, and the page hash when the reader had the bytes are stored

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QUOTE `{}`	Castorocauda is the earliest-known mammal that had specialized skeletal and soft-tissue features for swimming ... dated approximately 164 million years ago.