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RE: The Final Days

>> The 
ending of many lines of avian-dinosaurs at the K-T boundary is further 
evidence that something other than large size and large appetites were 
responsible for extinction. It would be of great interest if anyone had
answer to my questions about research.<<

Geography may have played a role, as well.  It's starting to look like
most extant vertebrate groups have their roots in the Southern
Hemisphere.  It makes sense intuitively, though someone will probably
shoot me down here.

Where do lungfishes, marsupials, ratites, and tuataras live?