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Re: Copeing with mammals



David Marjanovic (david.marjanovic@gmx.at) wrote:

<Both clades have produced forms with both lifestyles. But apparently not
at the same time.>

  In which case, as I said, the primitive small borophagines and the
advanced larger hesperocyons at the same time would NOT have been in the
same niche. Prey and carcass sources would have been managed and sought
after in different ways. It's like arguing that the territorial overlap in
jackals and lions makes them competitive in the same niche. Temporal and
close-body-size overlap in leopards and lions doesn't even make _them_
competitive. They'd have to live in similar territories, adapt to eating
the same food, in largely the same manner, and essentially be adapted the
same way, to be truly competitive.

  By the end of the hesperocyon radiation, taxa like *Enhydrocyon* were
curshing bones, but early borophagines like *Otarocyon* and *Aelurodon*
were generalists, some more than others, and they would have had an
entirely different dietary repertoire that would likely have not
endangered the specialist diets of the time.

  Cheers,

=====
Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)


                
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