A new troodontid dinosaur from China with avian-like sleeping posture

@article{Xu2004ANT,
  title={A new troodontid dinosaur from China with avian-like sleeping posture},
  author={Xing Xu and Mark A. Norell},
  journal={Nature},
  year={2004},
  volume={431},
  pages={838-841}
}
Discovering evidence of behaviour in fossilized vertebrates is rare. Even rarer is evidence of behaviour in non-avialan dinosaurs that directly relates to stereotypical behaviour seen in extant birds (avians) and not previously predicted in non-avialan dinosaurs. Here we report the discovery of a new troodontid taxon from the Early Cretaceous Yixian Formation of western Liaoning, China. Numerous other three-dimensionally preserved vertebrate fossils have been recovered recently at this locality… Expand
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References

SHOWING 1-10 OF 38 REFERENCES
A basal troodontid from the Early Cretaceous of China
TLDR
The discovery of Sinovenator and the examination of character distributions along the maniraptoran lineage indicate that principal structural modifications toward avians were acquired in the early stages of manIRaptoran evolution. Expand
New information on Cretaceous troodontids (Dinosauria, Theropoda) from the People's Republic of China
Troodontid specimens were recovered from three localities in China by the Sino-Canadian expeditions between 1987 and 1990. These include a Lower Cretaceous form (Sinornithoides youngi), which is theExpand
New Specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China
TLDR
New specimens of the diminutive theropod dinosaur Microraptor zhaoianus are described, found to be the sister taxon to other dromaeosaurs and apparently small size is primitive for Deinonychosauria, which has implications for bird origins. Expand
Osteology and Relationships of Byronosaurus jaffei (Theropoda: Troodontidae)
TLDR
Several interesting characters of Byronosaurus jaffei have implications both for theropod relationships and for understanding patterns of variation within coelurosaurian theropods. Expand
A nesting dinosaur
TLDR
The specimen described here is the first preserved well enough to determine its precise relationship with the nest, and provides the strongest evidence yet for the presence of avian brooding behaviour in non-avian dinosaurs. Expand
Palaeontology: Parental care in an ornithischian dinosaur
TLDR
A dramatic specimen of the small ornithischian dinosaur Psittacosaurus sp. Expand
The smallest known non-avian theropod dinosaur
TLDR
This is the first mature non-avian dinosaur to be found that is smaller than Archaeopteryx, and it eliminates the size disparity between the earliest birds and their closest non-Avian theropod relatives. Expand
A NEW TROODONTID THEROPOD FROM UKHAA TOLGOD, MONGOLIA
Troodontid theropods, originally described from isolated teeth that were at one time confused with those of pachycephalosaurs (Gilmore, 1924), are represented by only a few taxa known mostly fromExpand
The evolution of dinosaurs.
The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of theExpand
An Early Ostrich Dinosaur and Implications for Ornithomimosaur Phylogeny
TLDR
A new ornithomimosaur from the Yixian Formation of Liaoning Province People's Republic of China is described and this taxon is placed in a phylogenetic analysis of Coelurosauria and shown to be near the base of the ornithological clade. Expand
...
1
2
3
4
...