Made of keratin - the same material as fingernails - the sheath reveals that the claw itself was much longer than the underlying bones. It is the largest claw of its kind found fully preserved in this ...

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Two claws, they note, would have made each claw stronger than if there were three, allowing the dinosaur to grab thicker branches.

Made of keratin (the same material as fingernails), the sheath reveals that the claw itself was much longer than the underlying bones. It is the largest claw of its kind found fully preserved in ...

A sheep infected with bird flu will ring another alarm bell as the virus continues to drift into mammals. It's the first time anywhere in the world that a sheep is known to have been infected.

March 24 (Reuters) - Highly pathogenic avian influenza, commonly called bird flu, has increasingly spread to mammals and infected hundreds of people, raising concerns that it may lead to human-to ...