Palaeontology: Parental care in an ornithischian dinosaur

@article{Meng2004PalaeontologyPC,
  title={Palaeontology: Parental care in an ornithischian dinosaur},
  author={Qingjin Meng and Jinyuan Liu and David J. Varricchio and Timothy Huang and Chunling Gao},
  journal={Nature},
  year={2004},
  volume={431},
  pages={145-146}
}
Crocodilians and birds show extensive parental care of their young, but whether this behaviour evolved independently in these two groups of living archosaurs is unknown — in part because features of parenting among related fossil groups such as dinosaurs are unclear. A dramatic specimen of the small ornithischian dinosaur Psittacosaurus sp. (Dalian Natural History Museum D2156) from Liaoning in China reveals a single adult clustered with 34 juveniles within an area of 0.5 square metres… 
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TLDR
A fossil synapsid from the Carboniferous period of Nova Scotia that displays evidence of parental care is reported that adds to growing evidence that parental care was more widespread among Palaeozoic synapsids than previously thought and provides data permitting the identification of potential ontogeny-dependent traits within varanopids.
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