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Re: Marsupial forelimbs... or rather hindlimbs

On 11/26/07, Richard W. Travsky <rtravsky@uwyo.edu> wrote:
> >
> > Come to think of it, avians are basally ground nesters -- when did
> > tree-nesting begin? (And which clade is it limited to?)
> Well, not to be a smart ass, but when suitable trees and nesting material
> were available. As in, I'm not sure a tree fern would be suitable. By the
> late cretaceous, there were representatives of current species (like oaks)
> as I understand. Conifers are very old, tho, so surely some of these
> would be suitable and tree nesting could have happened very early on.

I was referring to the crown group, which didn't exist before the Late
Cretaceous -- I think tree-nesting is only present in a subclade of

Mike Keesey