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Re: no marine dinos/no viviparous dinos.
In a message dated 1/4/02 2:31:32 PM Eastern Standard Time,
> > Flying seabirds certainly can and do cross the equator.
> Loons have done it only once, BTW.
This reminds me of a question I've been meaning to ask.
Given the current distribution of loons/divers in the northern hemisphere
only, and the recent claims that loons and penguins are sister groups (anyone
have refs?), is it possible that the Antarctic "loon" (it's *Polarornis*,
right?) is actually on the penguin branch of the family tree?
Then again, how good is the fossil record for Gaviiformes? Is it possible
that _Gavia_ (to which all extant loon species belong) is the only northern