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Re: Marsupial forelimbs... or rather hindlimbs
On Nov 26, 2007 4:50 PM, David Marjanovic <email@example.com> wrote:
> Yes, but then, both the whales and the sea cows evolved more or less as
> early as possible, and immediately spread around the world. The sea cows
> didn't even wait till they had lost functional hindlegs (see *Pezosiren*
> from Jamaica). Then those niches were occupied, and nothing else was able to
> evolve into them anymore.
What about pinnipeds? They're not far off.
> The bats, too, apparently evolved around the Paleocene-Eocene boundary in
> the northern continents and immediately reached Australia. There are bat
> teeth in Tingamarra (dated as early Eocene last time I checked). Here, too,
> the marsupials may simply have come too late. Perhaps just a few hundred
> thousand years too late, who knows.
I'm confused though, as to why bats didn't face the same challenge
when invading the bird niche. (Is it because they're nocturnal?)