Over 65 million years ago, dinosaurs roamed and ruled the Earth. They were the top predators and where in an abundance of species. Today, scientist unearth their fossils and put them together to create an image of a lifetime. Even though no one was around when they were alive, we have an idea of what they looked like. If you have ever seen a dinosaur, you would probably think that they all were big giants that ate everything in sight! Although that is true, dinosaurs did eat almost everything, they weren’t all that big. Some of the dinosaurs that were recently discovered, were only the size of a domesticated chicken!
What Are Dinosaurs?
Dinosaurs were a diverse group of animals of the clade Dinosauria. In the Triassic period, 231.4 million years ago, the first dinosaurs appeared. They were the Herrerasaurus and the Eoraptor. They were the first (but not definitely not least) bipedal carnivores, which were meat-eating dinosaurs that walked on two legs. They were the dominate species, up until the start of the Jurassic period that occurred about 200 million years ago, where much bigger dinos were at an abundance. Up until the end of the Cretaceous period, dinosaurs played a huge role in Earth’s early history.
What happened to the dinosaurs? Where did they all go? Well, scientists have found that towards the end of the Cretaceous period, an asteroid had collided with Earth. This led to the extinction of three-quarters of Earth’s plant and animal life (along with all non-avian dinosaurs). The mass extinction is known today as the, “Cretaceous-Paleogene Extinction Event” or the “Cretaceous-Tertiary Extinction”. It marked the end of the Cretaceous period, and the entire Mesozoic Era.
Carnivores and Herbivores
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...e stones were known to be Gastrolith Stones, which were different stones held in the gastrointestinal tract. Gastroliths in some species are retained in the muscular gizzard, and used to grind food in animals lacking suitable grinding teeth. In other species the rocks are ingested and pass through the digestive system and are frequently replaced.
Still to be Found
New dinosaur species are still being found today by scientists all over the world. A dinosaur called, Aquilops americanus, had a skull that was unearthed in 2007, but was only identified in December of 2014. Aquilops was said to be a herbivore, because of its beak-like mouth. Another ancient creature that was found, was the Wooly Mammoth. A female wooly mammoth was found in the frozen ice caps of Siberia. Scientists think that she had maybe fallen into a swamp, and gotten frozen over, over 39,000 years ago.
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