This 236-Million-Year-Old Fossil Just Rewrote the Story of Live Birth
The vast majority of mammals alive today—including us—give birth to live young, but this reproductive mode isn’t unique to mammals nor universal among them. After all, egg-laying is common among reptiles, as well as the most ancient lineage of living mammals: the monotremes, which include platypuses and echidnas. However, efforts to determine whether cynodonts laid eggs or gave birth have been inconclusive—until now.
- ▪The vast majority of mammals alive today—including us—give birth to live young, but this reproductive mode isn’t unique to mammals nor universal among them.
- ▪After all, egg-laying is common among reptiles, as well as the most ancient lineage of living mammals: the monotremes, which include platypuses and echidnas.
- ▪However, efforts to determine whether cynodonts laid eggs or gave birth have been inconclusive—until now.
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Story provenance
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Record
| Original publisher | Gizmodo |
| Canonical URL | https://gizmodo.com/this-236-million-year-old-fossil-just-rewrote-the-story-of-live-birth-2000797767 |
| Publication time | Thu, 13 Aug 2026 04:00:46 +0000 |
| Retrieval time | 2026-08-13T04:04:20.557Z |
| Last seen | 2026-08-13T04:04:29.802Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 19tEO2oAxYXc · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
The vast majority of mammals alive today—including us—give birth to live young, but this reproductive mode isn’t unique to mammals nor universal among them. In fact, it evolved independently many times in other groups of vertebrates, and some mammal species actually lay eggs.cnx.cmd.push(function(){cnx({"playerId":"92b7b46b-43ed-4e0e-b21b-2c999302d9d7","settings":{"advertising":{"macros":{"AD_UNIT":"/23178111854/od.gizmodo.com/article","CHILD_UNIT":"article","POST_ID":"2000797767","POST_TYPE":"post","CHANNEL":"science","SECTION":"biology","SUBSECTION":"","CATEGORIES":"biology","TAGS":"human-reproduction,mammals,paleontology","NOP":"0"},"timeBeforeFirstAd":0}}}).render("cnx-player-main")}); For years, scientists believed cynodonts—a major group of mammal-like reptiles that gave rise to all…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Gizmodo.
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