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Yutyrannus is a Tyrannosaurid dinosaur, an early forerunner of Tyrannosaurus rex. It lived during the Lower Cretaceous 124.6 million years ago (mya). It was about 10 meters long and 3 meters tall, and is the largest known dinosaur with direct evidence of feathers.[1][2][3][4] It is forty times heavier than the previous record holder, Beipiaosaurus.[5][6] The feathers were long, up to 20 centimetres (7.9 in), and filamentous.

The fossil was found in what is now northeastern China. Three fossils of Y. huali, were all found in the rock beds of Liaoning Province. Because of its size, it is certain that Yutyrannus could not fly. The feathers were in support of other functions, such as temperature regulation and visual signalling.

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