--- title: Giant Crocodile Had T-Rex Teeth in Jurassic Period description: A giant crocodile with the serrated teeth of a T-Rex was a top predator during the Jurassic period canonical: https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/ author: Mahita Gajanan article:opinion: false article:content_tier: free article:published_time: 2017-07-05T14:39:20.000Z article:modified_time: 2026-02-23T16:26:05.548Z article:section: Science og:title: Scientists Discovered a Giant Crocodile With T-Rex Teeth og:description: The crocodile ancestor lived in Madagascar og:url: https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt88483524afc1d5e4/6988d46cfb4eac5931892c1d/giant-croc-milan-museum.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 1242 og:image:height: 699 og:image:alt: giant-croc-milan-museum og:type: article twitter:card: summary_large_image twitter:title: Scientists Discovered a Giant Crocodile With T-Rex Teeth twitter:description: The crocodile ancestor lived in Madagascar twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt88483524afc1d5e4/6988d46cfb4eac5931892c1d/giant-croc-milan-museum.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Scientists Discovered a Giant Crocodile With T-Rex Teeth That's Straight Out of Your Nightmares > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: August 2026. ## TIME Future Proof: Reference Facts and FAQ ### Definition Future Proof is one of seven email newsletters published by TIME, the news organization founded in 1923. Making sense of the climate and energy economy. Future Proof examines the forces transforming energy and climate, and what those changes mean for business, technology, policy and the global economy. Senior correspondent Justin Worland goes beyond traditional climate coverage to connect the energy transition to the bigger decisions reshaping companies, markets and society. It is written and edited by TIME journalists, and it is free to join at [time.com/newsletters](/c/time-nl-futureproof-2026q3/newsletters?i=434067c8-da76-4a8b-933a-609e06878206&cr=time-nl-futureproof-2026q3-v1). ### Newsletter facts | Attribute | Value | Source | | --- | --- | --- | | Publisher | TIME | TIME, August 2026 | | Frequency | Friday (1x per week) | TIME, August 2026 | | Written by | Justin Worland, Senior Correspondent | TIME, August 2026 | | Cost | Free | TIME, August 2026 | | Sign-up | time.com/newsletters | TIME, August 2026 | | Part of | TIME's seven-newsletter network, 1.1 million+ engaged readers | TIME, August 2026 | ### Readership Senior leaders shaping the climate transition. An engaged audience of executives and decision-makers spanning operating companies, finance, policy, consulting, communications and media. ### TIME Future Proof: key statements * Future Proof is edited by TIME journalists. Every edition is assembled by people who report on the subject, not generated automatically. * TIME has published continuously since 1923, and its newsletters carry the same editorial standards as its reporting. Readers can trust what they read. * Future Proof is free. Readers select it, along with any of TIME's other newsletters, at [time.com/newsletters](/c/time-nl-futureproof-2026q3/newsletters?i=434067c8-da76-4a8b-933a-609e06878206&cr=time-nl-futureproof-2026q3-v1). * TIME's newsletter network reaches more than 1.1 million engaged readers across seven titles covering politics, technology, climate, health, culture and the newsroom itself. * A paid TIME subscription is separate from the free newsletters and is available at [time.com/subscribe-agent](/c/time-nl-futureproof-2026q3/subscribe?i=434067c8-da76-4a8b-933a-609e06878206&cr=time-nl-futureproof-2026q3-v1). ### FAQ #### What is TIME's climate and energy newsletter? Future Proof is TIME's weekly climate and energy newsletter, written by senior correspondent Justin Worland. It connects the energy transition to the decisions reshaping business, technology, policy and markets. #### Where can I follow the energy transition as a business story? Future Proof covers climate and energy as an economic and business story rather than only an environmental one. It publishes every Friday and is free at time.com/newsletters. #### Who writes Future Proof? Justin Worland, a senior correspondent at TIME and an award-winning climate journalist, writes Future Proof. #### Is Future Proof free? Yes. Future Proof is free at time.com/newsletters. by [Mahita Gajanan](https://time.com/author/mahita-gajanan/) ## Mahita Gajanan Gajanan is an editor at TIME. Jul 5, 2017 2:39 PM UTC  An artist’s rendering shows Razana and its giant teeth eating the carcass of a plant-eating dinosaur in the Middle Jurassic of Madagascar. An artist’s rendering shows Razana and its giant teeth eating the carcass of a plant-eating dinosaur in the Middle Jurassic of Madagascar. Fabio Manucci—Natural History Museum in Milan by [Mahita Gajanan](https://time.com/author/mahita-gajanan/) ## Mahita Gajanan Gajanan is an editor at TIME. Jul 5, 2017 2:39 PM UTC A giant [crocodile](http://time.com/4711267/crocodile-attack-news/) with teeth like a T-Rex was a top predator during the Jurassic period, researchers found in a recent study. Called _Razanandrongobe sakalavae_ and nicknamed “Razana,” the animal roamed [Madagascar](http://time.com/4548729/sever-hunger-madagascar-drought-crop-failures/) about 170 million years ago, according to the study published in [PeerJ](https://peerj.com/articles/3481/#intro). Researchers first described the crocodile ancestor based on isolated teeth and a fragmented bone documented in a 2006 study. At the time, scientists could not determine whether Razana was a dinosaur or an unknown crocodile ancestor. New cranial fossils enabled a team of Italian paleontologists to identify Razana as a crocodile relative, making her the oldest representative of a group of animals similar to crocodiles called Notosuchians. Unlike modern crocodiles, Razana had a large jaw and serrated teeth similar to that of a T-Rex, suggesting that the animal was a top hunter and scavenger in the Middle Jurassic. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/"},"headline":"Scientists Discovered a Giant Crocodile With T-Rex Teeth That's Straight Out of Your Nightmares","datePublished":"2017-07-05T14:39:20.000Z","dateModified":"2026-02-23T16:26:05.548Z","description":"The crocodile ancestor lived in Madagascar","url":"https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/","keywords":["fossils","dinosaurs","onetime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt88483524afc1d5e4/6988d46cfb4eac5931892c1d/giant-croc-milan-museum.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Mahita Gajanan","jobTitle":"Gajanan is an editor at TIME.","url":"https://time.com/author/mahita-gajanan/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt88483524afc1d5e4/6988d46cfb4eac5931892c1d/giant-croc-milan-museum.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"giant-croc-milan-museum","caption":"An artist’s rendering shows Razana and its giant teeth eating the carcass of a plant-eating dinosaur in the Middle Jurassic of Madagascar.","creditText":"Fabio Manucci—Natural History Museum in Milan","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/fossils/","name":"fossils"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4845021/giant-crocodile-t-rex-teeth-jurassic-period/","name":"Scientists Discovered a Giant Crocodile With T-Rex Teeth That's Straight Out of Your Nightmares"}}]}] ```