Since chickens are descendants of dinosaurs, it shouldn't come as a surprise that many of the dinosaurs had feathers. Most of the dinosaurs that possibly had feathers belonged to the theropod branch. Paleontologists continue to discover fossils of feathered dinosaurs, like the one in the Liaoning Province of China, the Sinornithosaurus.
Surprisingly, the biggest dinosaurs weren't predators. The long-necked, four-legged sauropods were the biggest land animals ever. The biggest dinosaur, titanosaur Argentinosaurus huinculensis, was a herbivore and lived in South America (hence the name). Scientists think that once the Argentinosaurus hatched from its egg, it would continue growing for the entirety of its life.
Dinos may have been big in size, but not very intelligent. The T-Rex, for example, was thought to be as smart as a monkey once. But the newest research shows that they were more similar in their behavior to crocodiles and lizards. People like to joke that a stegosaurus, for instance, had a brain the size of two hot dogs. But scientists say that it was only the size of a walnut shell.
The tuatara, a reptile endemic only to New Zealand, often gets called the "only living dinosaur." But that isn't entirely true. Experts rather call them living fossils. They have been around since the time of dinosaurs for more than 200 million years, and live for 100 or more years. They also have a third eye on the tops of their heads, but, since it's covered in scales, it's not particularly helpful.
