A tiny distant cousin of Tyrannosaurus rex has been discovered in China with only a single claw on each forelimb.

Linhenykus monodactylus weighed no more than a large parrot and was found in sediments between 84 and 75 million years old.

The dinosaur belongs to a sub-branch of the theropods, the dinosaur group which includes T.rex and Velociraptor, and which gave rise to modern birds.

Details are published in Proceedings of the National Academy of Sciences....