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Re: Dinosaurs Breathed Like Birds

That's really interesting. I just finished reading Raptor Red by Dr. Robert "Jurassic Bob" Bakker, and he suggests the theory that dinosaurs breathed like birds at least as early as '95. I say it's interesting because his other "radical" ideas proved to hold water, such as the idea that dinosaurs were complex social creatures (which has pretty much become the norm). Bakker is, in my humble opinion, a legend.

----- Original Message ----- From: "Richard W. Travsky" <rtravsky@uwyo.edu>
To: <dinosaur@usc.edu>
Sent: Friday, July 15, 2005 11:33 PM
Subject: Dinosaurs Breathed Like Birds


Dinosaurs' hollow bones may have given them the puff to lead active
lifestyles. A fossil find shows that the group of dinosaurs that included
Velociraptor and Tyrannosaurus rex probably used the same super-efficient
respiratory system that birds have today.

The fossil, which is of a carnivorous dinosaur called Majungatholus
atopus, shows that its bones included spaces for storing air. This would
have allowed the species to have the quick metabolism necessary for an
active predatory lifestyle.

Birds have fast metabolic rates thanks to their efficient way of
extracting oxygen from the air. They have two lungs, as mammals do, but
the airflow through them is controlled by a complex system of air sacs
throughout the body. Most birds have nine such sacs, which also extend
through their hollow bones.

Patrick O'Connor, of Ohio University in Athens, and Leon Claessens, of
Harvard University in Cambridge, Massachusetts, compared the structure of
air sacs in M. atopus's vertebrae to those in more than 200 living birds.
The structures were very similar, they report in this week's Nature.