Re: Two more gaps in the fossil record

mortongr@flash.net
Sat, 16 Oct 1999 12:51:27 +0000

At 07:59 PM 10/15/1999 -0700, Cliff Lundberg wrote:

>As to the matter of hollow bones, one may wonder which came first, the
>light hollow bones that facilitate flight and rapid respiration, or the
flight
>that brought selection pressure for such bones. There may have been niches
>in which lightness and high metabolism was advantageous for a terrestrial
>organism. For example, in trees or in dry open country, neither of which are
>likely spots for fossilization.

Hollow bones break easily, they are a decided disadvantage to a land-living
creature. If there were an advantage, why no hollow boned mammals today?
glenn

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