posted on Jun, 3 2009 @ 08:14 PM
Originally posted by ravenshadow13
[Dinosaurs are] Not just terrestrial. They count plesiosaurs as dinosaurs.
Just for the record, "Dinosaurs" proper are considered a separate animal group, quite distinct from reptiles.
Reptiles are and have always been cold-blooded creatures with distinct skeletal and motor characteristics — they utilize "side arm" propulsion,
for example, with their bellies touching or nearly touching the ground.
Dinosaurs, on the other hand, because of their immense size alone, are thought to have been warm-blooded
creatures, probably more akin to birds
than to lizards. Dinosaurs also stood tall on their legs, with their body weight high above the ground, like elephants, but entirely unlike
Also, the Plesiosaur
is not considered a dinosaur — it had distinctly reptilian skeletal characteristics, and is classified as a marine
reptile. Interestingly, the Pterosaurs
— everyone's favorite "flying dinosaur" — weren't dinosaurs, either, they were reptiles.
— Doc Velocity
[edit on 6/3/2009 by Doc Velocity]