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re: polar sauropods

Nyet on dinosaurs migrating from polar regions. The distances that must be
traveled are so extreme that it is not energetically feasible, even caribou
(which have extremely energy efficient legs) make no attempt to move out of
polar winters. Only creatures that fly or swim - both much more energy
efficient per kilometer than walking - can migrate far enough to avoid high
latitude winters. I've published on this subject in Encyclopedia of Dinosaurs
(Currie & Padian) 1997 and Journal of Paleont 62:640-652 1988.