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It has a high content of hard silica, and produces a great deal of wear on teeth. It
is also very indigestible, requiring sophisticated digestive systems. The
geography of grasslands also imposes restrictions on the animals that live there.
Grass is full of hard silica and so it causes a great deal of wear to teeth. A grass-
eating animal needs teeth that are constantly growing or frequently replaced.
Complex digestive systems are needed to break down and extract nutrients from
I> The skull of the nauger is perfectly adapted to its purpose of drilling into solid
wood The teeth grow only at the front of the jaw and are directed forward, each
one lending support to the one before. Those at the very front bear the brunt of
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The new dinosaurs: an alternative evolutionUser Review - Not Available - Book Verdict
Many sf writers have created worlds where dinosaurs still walk the earth, but Dixon's new book pursues the premise in the most realistic way yet. In After Man: A Zoology of the Future (LJ 10/15/81 ... Read full review
the new tree of life
the new dinosaurs
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