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Dinosaurs Eating Mammals! Oh No!

  Another interesting dinosaur aspect is that in Hurum, Luo & Kielan-Jaworowska
(2006), the specimen of *Sinosauropteryx*, GMV 2124 (identified as *S. prima*,
though Currie and Chen, 2001 were less certain), which bears mammal jaws
anterior to the pelvis has had its jaws identified as *Zhangheotherium* and
*Sinobaatar*. The two mandibles are well-illustrated probably for the first
time (other photos are indistinct on what is what), and shown clearly for what
they are. The *Zhangheotherium* jaws are paired, while that of *Sinobaatar* is
single partial dentary. This identification follows specimens of the latter
which are known to bear an os calcaris and a calcareous spur, as in living
monotremes, thus showing that *Sinosauropteryx* ate possibly poisonous mammals.
Perhaps it dies from toxic poisoning?

  Hurum, J. O., Z.-x. Luo, & Z. Kielan-Jaworowska. 2006. Were mammals
   venomous? _Acta Palaeontologica Polonica_ 51(1):1?11.


Jaime A. Headden

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

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