Yutyrannus huali

Overview

Yutyrannus huali is an early tyrannosauroid with filamentous feathers preserved on a large body. A deep head and three fingers are also distinctive. This animal shows that feathers were not a feature of small dinosaurs alone.^[1][3]

Key facts

Feathers are known from different regions in a specimen interpreted as an adult and two much younger specimens. The tail, pelvis, neck, and other areas provide clues. Multiple individuals allow growth and body coverings to be compared together.^[1]

Time and place

It is known from present-day northern China in the Early Cretaceous, about 125 million years ago. Fossils were studied as material from the Yixian Formation. Alongside other Early Cretaceous organisms of this region, it reveals the diverse bodies of feathered dinosaurs.^[2][1]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

Its body has a large, deep head with bony ridges and three fingers. The femur of V5000, interpreted as an adult, was reported as about 85cm long. The body mass of about 1.4t for the same specimen is a model estimate based on the skeleton.^[1]

Habitat and reproduction

Feathers were present on the body of a large carnivorous dinosaur. Evidence of body coverings adds to research on the head, hands, and hind limbs. It invites exploration of the relationship between large size and feathers and differences between juveniles and adults.^[1]

Fossil discovery

A 2012 study introduced this giant feathered dinosaur based on three skeletons. Researchers considered bone fusion and size to distinguish a seemingly adult specimen from juveniles. Bodies at several growth stages became evidence for understanding the group’s appearance.^[1]

References

1. A giant feathered dinosaur from the Early Cretaceous of China
2. Yutyrannus huali — NHM genus guide
3. Xu et al. (2012) — Relationship between large body size and feathers
4. American Museum of Natural History — The story of Tyrannosaurus

Research questions

What form did feathers take as the body grew large? Feather positions and skeletons are compared in specimens of different sizes. Changes through time in tyrannosauroid hands, heads, and body coverings can also be explored together.^[1][3]

Observation

Move your gaze from the deep head to the forelimbs with three fingers. Follow the outlines of the neck, trunk, and tail while imagining the combination of a large dinosaur and feathers.^[1]