Science (1997;278)

["Colette H. Adams" <cadams@hh.gpz.org>]

With regard to the article in Science (1997;278), I hesitate to comment
without seeing it, but I don't really understand how it was concluded that
particular theropods lack avian-type lungs.  Greg Paul has commented on a
number of occasions about the lung structure of theropods and gives
evidence for avian-type lungs in most.  But they are arguing that
Archaeopteryx was an ECTOTHERM?  I'm afraid my credulity has limits.

With regard to endothermy and running, note that some ectotherms can sprint
quite nicely, and big monitors can maintain quite a speed for some time.

Best regards,

Dave