Re: "Dinosaurs Died Within Hours After Asteroid Hit Earth..."

[David Marjanovic <david.marjanovic@gmx.at>]

> What I am wondering is if birds really did come from just one narrow line
of
> coelorusaurs.

I almost wanted to answer, but that's not possible when I don't know your
definition of "birds". :-)

> My question on birds originating in Antartica or on the southern continent
> is were not other dinosaurs also in that place at the time.

Yes.

> If as the genetic studies suggest the major categories of birds
> diverged during the Cretaceous,

Forget them, they are miscalibrated... but there are indeed several clades
of modern birds known from Cretaceous fossils: duck relatives
(Anseriformes), chicken relatives (Galliformes), loons (Gaviidae), arguably
cormorants (Phalacrocoracidae), and what seem to be shorebirds
(Charadriiformes).

> How come they were the only dinosaurs?

They were small. They weren't directly dependent on green plant parts. They
were able to fly, allowing them to live off widely dispersed food. This
sounds plausible, I think.