Birds evolved from dinosaurs, and some dinosaurs were warm-blooded. Mammals existed at the same time as dinosaurs, and most dinosaurs were vegetarian. Many dinosaurs had some form of intelligence as well.Continue Reading
Modern species of birds evolved from a common feathered ancestor, the theropod, starting around the end of the Jurassic and Cretaceous periods. Even though modern reptiles are cold-blooded, which means that their body temperature fluctuates with the surrounding climate, most carnivorous dinosaurs were more likely to be warm-blooded because of their predatory lifestyle, which is why birds are also warm-blooded. Meat-eating predators like the Tyrannosaurus rex and Giganotosaurus are rare compared to the amount of dinosaurs that had a vegetarian diet. Paleontologists speculate that herbivorous dinosaurs like the hadrosaurs, ornithopods and sauropods grazed on vegetation in herds like modern cattle graze in pastures.
The mammals that lived during the same time period as dinosaurs lived in treetops far away from predators during most of the Mesozoic Era. These mammals were small and furry and looked like mice. Other mammals, such as the 50-pound Repenomamus, hunted dinosaurs. Hunters such as T. rex and Troodon had more grey matter than herbivores like the stegosaurus. These predators had more thinking power than their prey and had a keen sense of coordination and heightened senses.Learn more about Dinosaurs
An herbivorous dinosaur is a dinosaur that only eats plants. The majority of dinosaur species were herbivores, including the brachiosaurus, stegosaurs, triceratops, astrodon, ankylosaurus and ornithopsis.Full Answer >
Most paleontologists believe that the Argentinosaurus was the largest dinosaur to have ever lived. It may have been the largest land animal to have ever existed.Full Answer >
The largest known carnivorous dinosaur is the Spinosaurus, which is so named thanks to the gigantic spikes that run down the dinosaur's back. These spikes form a "sail" that likely evolved to ward off enemies rather than predators. The Spinosaurus was likely too large to be preyed upon by other dinosaurs.Full Answer >
Though there have been a few instances of scientists purporting to have found larger specimens, the longest known dinosaur that is widely accepted by paleontologists seems to be the Diplodocus, a type of sauropod dinosaur with a long neck and long tail that is said to have measured as much as 175 feet in length. There seems to be some controversy and debate around the question of which dinosaur is truly the longest, with scientists introducing competitors such as the Seismosaurus, which was once thought to be a distinct species but was eventually found to be a very large Diplodocus specimen. The Seismosaurus' discovery was announced in 1991, but its existence as a unique species was debunked just over a decade later, a fact that was announced at an academic event in 2004.Full Answer >