There were four different species of Stegosaurus. The largest was Stegosaurus armatus, which grew to be 30 feet long and weighed 5.5 tons, meaning that they had a mass of about 5,000 kg. That is within the range of the weights of African elephants.
Stegosaurus had a brain that weighed about 2.8 oz, the same as a dog's brain. An apple weighs almost twice that much. That is very small considering the fact that the Stegosaurus was 30 feet long and weighed 5.5 tons.
Stegosauruses is valid (http://en.wiktionary.org/wiki/stegosauruses), but so is Stegosaurus (http://www.memidex.com/stegosaurus+reptile-genus). The same way Fish and Fishes are both valid. Usage is the same as well.
There are four currently accepted species in the genus Stegosaurus. They are Stegosaurus armatus, Stegosaurus stenops, Stegosaurus sulcatus, and Stegosaurus longispinus.
walnut
The remains of about 80 different Stegosaurus have been discovered. They belong to four different species, Stegosaurus armatus, Stegosaurus stenops, Stegosaurus sulcatus, and Stegosaurus longispinus.
Stegosaurus had a brain that weighed about 2.8 oz, the same as a dog's brain. That is very small considering that the Stegosaurus was 30 feet long and weighed 5.5 tons. People often say that its brain was the size of a walnut or a pea, but that exaggerates its small size.
ferns and leaves
Stegosaurus had a brain that weighed about 2.8 oz, the same as a dog's brain. That is very small considering that the Stegosaurus was 30 feet long and weighed 5.5 tons. People often say that its brain was the size of a walnut or a pea, but that exaggerates its small size.
Stegosaurus fossils actually date to between 155 and 150 million years ago. Using various methods, paleontologists are able to determine the age of rocks. Then they know that fossils in those rocks are the same age as the rocks. In the case of Stegosaurus, they know the rocks are between 155 and 150 million years old, and they know the Stegosaurus fossils are the same age.
Albertosaurus lived between 71 and 68 million years ago. Stegosaurus lived between 155 and 150 million years ago, meaning that they died out 79 million years before Albertosaurus existed. If they had lived at the same time and in the same place, though, Albertosaurus would have hunted Stegosaurus.
Baby Stegosaurus would have made an easy meal for almost any carnivorous dinosaur, even small ones like Ornitholestes. However, Stegosaurus lived in herds and the parents would have done their best to protect the youngsters. Adult Stegosaurus had predators too, though. Carnivorous dinosaurs large enough to hunt adult Stegosaurus include Ceratosaurus, Torvosaurus, Allosaurus, Epanterias, and Saurophaganax.
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