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palaeontology

Tyrannosaurus rex dinosaur, illustration

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We may finally know why dinosaurs like T. rex evolved tiny arms

Five different groups of predatory dinosaurs independently evolved disproportionately small arms, and it seems they did so because their heads became so large and powerful

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Extinct relative of koalas discovered in Western Australia

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Why birds are the only surviving dinosaurs

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Why birds are the only surviving dinosaurs

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A sketch of the giant octopus

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Largest-ever octopus was great white shark of invertebrate predators

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An ancient radiolarian

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Hidden fossils reveal secrets of oceans before major mass extinction

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Surprise fossil discoveries push back the evolution of complex animals

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Fossils discovered in Egypt may be the closest ancestor of all apes

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Ancient 'weirdo' reptile graduated from 4 legs to 2 in adolescence

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Top predators still prowled the seas after the biggest mass extinction

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Tiny predatory dinosaur weighed less than a chicken

The alvarezsaurs were thought to have evolved a smaller stature because of their diet of ants and termites, but a new fossil found in Argentina casts doubt on that theory

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New fossils may settle debate over mysterious sail-backed spinosaurs

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Huge fossil bonanza preserves 512-million-year-old ecosystem

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Our earliest vertebrate ancestors may have had four eyes

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T. rex took 40 years to become fully grown

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