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RE: Combined answer: smallest ANCIENT non-bird dinosaur - was what I was asking

> Yes, that's my impression too.  For the longest time
> both _Ichthyornis_ and _Hesperornis_ were allied
> with grebes and loons

... by some, at least in the latter case
(_Ichthyornis_ would probably have been allied with
terns and gulls). But see doi:10.1007/BF01908745 here:
http://www.springerlink.com/content/p8362gn204701848/
- the German bit is "... a comparison of their
hindlimbs" and he concludes that it's convergence.
Sharp eyes!


Eike


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