Palaeontologists say the remains date back 70 million years, close to the end of the dinosaurs.
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Two million years ago, Africa was home to three human-like species, new discoveries reveal.
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The fossils of the predator, which stood around 8ft (2.4m) tall, were found by a farmer in Alberta.
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Purussaurus mirandai could grow to 10m in length and was able to move on land, scientists believe.
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