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Re: Dinosaurs Eating Mammals! Oh No!

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,

You mean the former. While several other multituberculates (*Kryptobaatar* and *Chulsanbaatar* for a start) have spurs, others (the only known foot of *Sinobaatar*, and all specimens of *Ptilodus*) lack them.

As for the venom... what use would this kind of spur be without it? What do echidnas use their venomless spurs for?