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Re: therizinosaurs - how did it happen?
On Thu, Aug 6th, 2009 at 4:53 AM, Roberto Takata <email@example.com> wrote:
> Two instances of opposite direction:
> Chick eating cow
> Bird bone eating deer
It's amazing what animals will do when suffering from mineral deficiencies. The
Mt Elgon elephants
in Kenya have turned to mining to satisfy their mineral requirements.
Deer on mineral-poor Mediterranean islands are habitually carnivorous (again,
they favour bird
nestlings). It's not unthinkable that herbivores pushed into marginal habitats
that are poor in
nutrients would eventually evolve into omnivores or even carnivores. Thylacaleo
(where heavily weathered soils are notoriously mineral-poor in many areas) were
herbivores. Their ancestors lacked canine teeth, so instead the front incisors
took over the role.
GIS / Archaeologist Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj