The idea that Stegosaurus had a "brain the size of a walnut" (an oft-repeated phrase), was not quite accurate.It had a brain the size of a dog's, but in proportion to its body, the brain was very small.

Troodon is famous for being one of the few carnivorous dinosaurs whose parenting routines are known in detail. For further information about the data, see theSTAT 100 at UIUC Web Page. Troodon was a small, bird-like dinosaur that lived during the Cretaceous Period, about 76 million years ago. Larsson's study compared the ratio of the The method used for Larsson's comparison was not the EQ, but a ratio of the size of the The brains of dinosaurs were generally much like other reptiles in their proportions. Troodon had a very large brain for its size—even larger, relatively speaking, than the brains of modern reptiles.

While Troodon is often touted as the world's smartest dinosaur, this both exaggerates this carnivore's intelligence and plays down its other, equally intriguing attributes.

Return to the MSTE Data Archive. Fossil specimens of Troodon have been discovered across the expanse of North America, in late By contrast, the eyes of many herbivorous animals are set toward the sides of their heads, an adaptation that allows them to detect the presence of approaching carnivores. Brain size usually increases with body size in animals (is The formula for the curve varies, but is usually given as Intelligence in animals is hard to establish, but the larger the brain is relative to the body, the more brain weight might be available for complex Adding difficulty is the wide range of estimates for live mass.While it is difficult to estimate the absolute volume of the brain, the proportions of its various regions of the brain should be the same in the endocast as it was in the live brain. The name Troodon (pronounced TRUE-oh-don) derives from a single tooth discovered in 1856 by the famous American naturalist However, the brain of the modern reptile genus Sphenodon fills only about half of its endocranial volume. DESCRIPTION: Average brain and body weights for 27 species of land animals. Not only were the eyes of Troodon larger than normal, but they were set toward the front rather than the side of this dinosaur's face—an indication that Troodon possessed advanced binocular vision, with which it could target small, skittering prey. Traditional comparisons of brain volume to body mass in dinosaurs have estimated brain size as the volume of the endocast.

So, despite its brain size, it was very successful. Although Triceratops probably was not the smartest dinosaur, it was one of the most abundant Late Cretaceous dinosaurs. It likely would have been approximately a walnut and a half, Morhardt said. The black object on the right is an endocast, or brain cavity mold, made from the inside of the brain case bone on the left. Triceratops had a small brain; the ratio of its brain size to its body size is lower than two-legged dinosaurs, such as the duckbills and meat-eaters. with the eponymous genus of the breed, Troodon. Dinosaur intelligence has been a point of contention for paleontologists. VARIABLES: body: body weight in kg brain: brain weight in g SIZE: Observations = 27; Variables = 2. An egg-layer, it had behaviors in common with both crocodiles and birds; scientists are still uncertain about its status as an ancestor of either or both. The forelimbs, which were shorter than the rear ones, each had three hooves; the rear limbs had four hooves each. In 1932, the American paleontologist Charles H. Sternberg erected the new genus Stenonychosaurus, which he classified as a basal theropod closely related to Coelurus. The most notable feature of Troodon was its unusually large brain, which was heftier, in proportion to the rest of its 75-pound body, than the brain matter of comparably sized theropods. Triceratops also had a small brain, given its large body size. Some of the better-known troodontids include the evocatively named

(7,150 kg). While dinosaur brains don’t fossilize, we can get a sense of how small they are relative to the rest of its body by making a copy of the space inside their skull bones. In 1986, These findings were contested a few years later by Catherine Forster, who reanalyzed In 2009, John Scannella and Denver Fowler supported the separation of The skull also featured a pair of "brow" or supraorbital horns approximately 1 m (3.3 ft) long, with one above each eye.The lower jaws were elongated and met at their tips in a shared epidentary bone, the core of the toothless lower beak.

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