http://www.daviddarling.info/encycloped ... ntell.html => It's clear that some dinosaurs were getting smarter at the time the asteroid that hit the Yucatan, and created the Chixulub Crater, handed the gauntlet to the mammals (fortunately for us). One of the brainiest dinosaurs we know about at the end of the Cretaceous was Troodon (a.k.a. Stenonychosaurus inequalis) a 1.2-meter-tall, 70-kg carnivorous dinosaur with perhaps the intelligence of an opossum. What if Troodon had survived and continued to evolve and get brainier? In the early 1980s, paleontologist Dale Russell, curator of vertebrate fossils at the National Museums of Canada, in Ottowa, explored this possibility.1 Had the dinosaurs survived, argued Russell, and a species like Troodon grown smarter, it would eventually have needed to stand upright to balance its heavy head. A shoulder structure would have evolved to allow the "dinosauroid" to throw objects. Projecting how other characteristics of this species might have developed he came up with a model of a large-brained, reptilian biped with enormous eyes, three-fingered hands, an absence of external genitalia (typical of reptiles), and a navel (since a placenta is found in some modern reptiles and may have been needed to enable the birth of young with big brain cases).
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