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Re: Troodon again
At 06:12 PM 9/22/97 +0100, you wrote:
>If you don't mind I would like to continue arguing about the intelligence of
>I have now the concrete data. The Troodon had 0.1% brain to body mass ratio,
>( the ratio is the important thing not the absolute size )
>and if we do not count it's tail ( since we want to compare to mammals that
>usually do not have a heavy tail ) than it is 0.13%
But the tail IS part of the body mass (and a fraction of the brain would be
involved in running the tail), so you cannot dismissis it, any more than you
can dismiss the arm or leg of a gorilla.
>The primates have about 1% to 0.15% brain to body mass ratios. The adult male
>gorillas have something like 0.2-0.15%
>And the Homo Sapiens have something like 2%
Ah..., I see where you might be misled. Don't forget to scale you
brain/body ratios to the *total body size*. If you don't, you wind up with
nonsense like kittens of _Felis cattus_ having four or five the brain/body
size as adult _Panthera leo_ (with no apparently stupidity in lions compared
to kittens), or rodents having greater brain/body sizes than humans!
See the work of Hopson or various others on brain/body size and
encephalization quotients (referenced in most dinosaur books, such as
Fastovsky & Weishampel's The Evolution and Extinction of Dinosaurs).
>So the Troodon ( and probably other coelosaurs if I know it's group name well )
>are not so bad.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:email@example.com
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661