Tyrannosaurus, like most dinosaurs, was long thought to have an ectothermic ("cold-blooded") reptilian metabolism.
The idea of dinosaur ectothermy was challenged by scientists like Robert T. Bakker and John Ostrom in the early years of
the "Dinosaur Renaissance", beginning in the late 1960s. Tyrannosaurus rex itself was claimed to have been
endothermic ("warm-blooded"), implying a very active lifestyle .
Kids love to color dinosaurs and imagine what they looked like millions of years ago. Dinosaur coloring pages are a great way to teach early earth history.