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Need To Know > News > Animals > Fossil of ‘hypercarnivore’ killer croc discovered by scientists – and it might have EATEN dinos
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Animals

Fossil of ‘hypercarnivore’ killer croc discovered by scientists – and it might have EATEN dinos

Sam Coffey
Last updated: August 28, 2025 11:16 am
Sam Coffey Published August 28, 2025
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A restoration of The Kostensuchus atrox. (Jam Press/Gabriel Diaz Yanten)
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Scientists have uncovered the fossil of a giant killer crocodile that may have gone head-to-head with dinosaurs 70 million years ago.

The remains of Kostensuchus Atrox (K. Atrox) – including its skull, jaws and part of its skeleton – were dug up near El Calafate in southern Patagonia, Argentina.

Researchers from the Museo Argentino de Ciencias Naturales, led by Fernando Novas, believe the beast was a 11.5ft, 250kg “hypercarnivore” – a meat-munching apex predator at the top of the food chain.

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The fearsome croc, part of the extinct peirosaurid family related to modern gators, prowled the region when it was teeming with dinosaurs, turtles, frogs and early mammals, as reported by Need To Know.

Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
The skull of the Kostensuchus atrox. (Jam Press/Gabriel Diaz Yanten)

Unlike earlier omnivorous crocs, K. Atrox’s huge teeth suggest it was built for tearing into big prey – including dinos themselves.

Experts say the discovery supports the theory of a shift at the time from smaller, mixed-diet crocs to supersized predators.

Although not a dinosaur, scientists say the prehistoric monster was a dominant force – a true top predator of its era.

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Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Skull and jaw of the Kostensuchus Atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
A mounted skeleton that was reconstructed by 3D print and painted of the Kostensuchus atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Skull and jaw of the Kostensuchus Atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Details of rostral anatomy of the Kostensuchus Atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Dorsal vertebrae of the Kostensuchus atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
Cervical vertebrae of the Kostensuchus atrox. (Jam Press/Gabriel Diaz Yanten)
Scientists in Argentina discovered fossils of Kostensuchus Atrox, a 250kg killer crocodile that lived 70 million years ago and likely hunted dinosaurs as a top predator.
The remains of Kostensuchus Atrox (K. Atrox) – including its skull, jaws and part of its skeleton – were dug up near El Calafate in southern Patagonia, Argentina. (Jam Press/Gabriel Diaz Yanten)

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