Editor's choice
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Giant predatory dinosaur Spinosaurus was scourge of prehistoric rivers
Fossil remains found in Morocco add to evidence that huge meat-eating Spinosaurus spent most of its time in water
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Scientist who identified Ebola virus calls for 'quasi-military intervention'
London-based microbiologist Professor Peter Piot urges creation of UN peacekeeping force to fight 'catastrophe' in west Africa
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Lost frogs: finding the world's rarest amphibians – in pictures
Conservationist Robin Moore's photographs from his journey around the world to find lost species
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