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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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Cannibalism may explain why some orcas stay in family groups

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Everyone's a queen: The ant species with no males or workers

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A horse's whinny is unlike any other sound in nature

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Fish-based pet food may expose cats and dogs to forever chemicals

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New fossils may settle debate over mysterious sail-backed spinosaurs

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More dog breeds found to have high risk of breathing condition

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Newborn marsupials seen crawling to mother's pouch for the first time

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Five stunning images from the Close-up Photographer of the Year awards

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Five stunning images from the Close-up Photographer of the Year awards

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Bonobo's pretend tea party shows capacity for imagination

Kanzi, a bonobo with exceptional language skills, took part in a make-believe tea party that demonstrated cognitive abilities never seen before in non-human primates

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Ants attack their nest-mates because pollution changes their smell

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Polar bears are getting fatter in the fastest-warming place on Earth

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

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Piercing crocodile close-up wins ecology photo competition

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