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Re: Alvarezsaur spurs (was Re: dino-lice)
On Mon, May 2nd, 2011 at 11:01 AM, Tim Williams <email@example.com> wrote:
> Dann Pigdon <firstname.lastname@example.org> wrote:
> > Sure - but that would require specialised claws and digging physiology,
> > which would make it
> > difficult to run from danger. At the moment the aardwolf is specialised
> > enough to be able to
> > largely on termites, but not so specialised that it can't run like the
> > clappers when it needs
> > Whereas the aardvark doesn't have the luxury of speed to escape danger. The
> > even more
> > specialised giant anteater is slower yet again.
> All true. Nevertheless, the giant anteater can use its massive
> foreclaws as a weapon when confronted, typically by adopting a
> bipedal/tripodal posture. Jaguars are known to fall afoul of an
> anteater's claws.
> To return to dinosaurs, this is how I imagine therizinosaurs used
> their foreclaws. If you can't be fast, be formidable.
That's all fine and dandy *after* you have acquired massive muscles and claws,
but I wonder how
often myrmecophages actually make it past the 'hump' between having no digging
but fast locomotion, and developing highly specialised digging equipment that
can also compensate
for the reduced locomotor abilities. It would seem that the in-between states,
where you can't quite
run fast enough to avoid predators, but also don't quite have the right
equipment to fend them off,
would be a very vulnerable point in their evolution.
Echidnas seem to have managed it by developing defensive spines, but I can't
help but wonder
whether the giant anteater evolved its current form during a time when large
predators were rare
in their environments. Then again, aardvarks seem to be in that in-between
phase at the moment.
Perhaps in their case being largely nocturnal and sheltering in burrows has
compensated for their
lack of speed and power (although they *will* attack using their claws as a
Spatial Data Analyst Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj