Lizards, who walking on all four legs, would have smaller muscles, smaller bones and they definitely use less energy. Another example is their ability to walk upright, like birds do, which would have required bigger muscles, stronger bones and more energy. Lizards have fairly small brains for their size.
Dinosaurs had brain-sizes more like mammals, who have fairly large brains compared to their body size. It was John Ostrom and his student Robert Bakker (who was a consultant on the Jurassic Park movies), who approached the idea again in the 1960s, while they worked on linking the evolution of dinosaurs and birds.īakker argued that dinosaurs were active animals, based on their size and body structure, with similarities between their bodies and the bodies of birds and mammals, and differences between them and lizards. Although there had been some speculation about dinosaurs being warm blooded as far back as the 1850s, the long-standing idea about these huge creatures was that they were cold-blooded, like lizards. When Jurassic Park hit the big screen in 1993, it introduced an idea that many in the general public hadn't heard about - that dinosaurs may have been warm-blooded. A new study released earlier this month may have finally provided the evidence that lays to rest the idea that dinosaurs were cold-blooded.
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