80-Million-Year-Old Snake Fossil From Brazil Offers New Clues to Why These Creatures Started Slithering
Snakes have managed to live comfortably without limbs for millions of years, but why they evolved to slither rather than walk has remained an ongoing mystery. Competing theories have each pleaded their case based on ancient environments, arguing over whether the first snakes evolved to navigate underwater, on land, or underground. A new study published in Nature has entered the debate with evidence that could change everything, all based on an 80-million-year-old fossil of an early snake found in Brazil.
- ▪Snakes have managed to live comfortably without limbs for millions of years, but why they evolved to slither rather than walk has remained an ongoing mystery.
- ▪Competing theories have each pleaded their case based on ancient environments, arguing over whether the first snakes evolved to navigate underwater, on land, or underground.
- ▪A new study published in Nature has entered the debate with evidence that could change everything, all based on an 80-million-year-old fossil of an early snake found in Brazil.
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Story provenance
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Record
| Original publisher | Discover Magazine |
| Canonical URL | https://www.discovermagazine.com/80-million-year-old-snake-fossil-from-brazil-offers-new-clues-to-why-these-creatures-started-slithering-49453 |
| Publication time | Fri, 24 Jul 2026 22:45:00 GMT |
| Retrieval time | 2026-07-24T22:51:38.573Z |
| Last seen | 2026-07-24T22:51:38.573Z |
| 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 | 2fiEggVkXTFH |
| 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
Snakes have managed to live comfortably without limbs for millions of years, but why they evolved to slither rather than walk has remained an ongoing mystery. Competing theories have each pleaded their case based on ancient environments, arguing over whether the first snakes evolved to navigate underwater, on land, or underground. A new study published in Nature has entered the debate with evidence that could change everything, all based on an 80-million-year-old fossil of an early snake found in Brazil. While this snake had a dense skull suggesting it spent its days burrowing headfirst underground, another ancient snake had features better suited to a surface-dweller.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Discover Magazine.
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