Scientists have no idea what color or colors the dinosaurs were.
Over 1000 different species of dinosaurs have been named and the list continues to grow as new fossils are discovered.
Some of the largest fossilized dinosaur eggs ever discovered were found in China in the mid 1990’s. The eggs are over 60cm (2ft) long and 20cm (8in) wide.
Thomas Jefferson found the first dinosaur fossil in the Americas and expostulated that giant creatures once roamed the Earth.
Dinosaur fossils have been known for a long time in human history but it wasn’t until the early 19th century that they were formally recognized as the dinosaurs we know about today.
The largest tooth of any carnivorous dinosaur found to this date is that of a T-Rex. It is estimated to have been around 30cm (12in) long when including the root.
When Tyrannosaurus rex was around the age of 14, its body size would increase rapidly, putting on around 600kg (1300lb) a year over the next 4 years.
There is also strong debate about whether Tyrannosaurus rex was a predator or scavenger. It had small arms which would have made it hard to grip prey, suggesting it may have been a scavenger. On the other hand, evidence in favor of it being a predator includes its forward pointing eyes which give better depth perception and make it easier to hunt.
Triceratops lived in the late Cretaceous Period (around 65 million years ago).
The Triceratops is one of the most easily recognizable dinosaurs due to its large body, unique frill and three horns. It needed its three horns to try and protect itself from the Tyrannosaurus Rex which lived during the same time period.
It is believed that fully grown Triceratops were about 8m (26ft) in length, 3m (10ft) in height and weighed anywhere between 6 to 12 tons.The skull of a Triceratops alone could grow over 2m (7ft) in length.
The Triceratops was a plant eating (herbivore) dinosaur. And, it had anywhere between 400 and 800 teeth, although only a small percentage of these were in use at any one time as they were constantly replaced throughout its lifetime.
Allosaurus lived around 150 million years ago in the late Jurassic Period.
Allosaurus was first described by Othniel Marsh in 1877 and become one of the first well known dinosaurs. Marsh also named and gave the first description of theApatosaurus (Brontosaurus) in that same year.
Most Allosaurus fossils have been found in the Morrison Formation, a distinctive band of sedimentary rock found in the western United States.
Allosaurus had a large skull and walked on two legs. Its body and head were balanced by a long and heavy tail. Like the Tyrannosaurs rex, the Allosaurus had short arms. It had three fingers that were each tipped with sharp, curved claws. And, research suggests that the average length of an Allosaurus was around 8.5 metres (28 feet) and that it weighed around 2.3 tons.
Iguanodon lived in the early Cretaceous Period, around 125 million years ago.
The Iguanodon was first discovered in 1822 by English geologist Gideon Mantell.
The Iguanodon was a plant eater (herbivore).
It could easily shift between moving on two limbs or four.
The Iguanodon weighed around 3.5 tons and reached around 10 metres (33 feet) in length.
Iguanodon had a thin skull and long tail.
The largest collection of Iguanodon fossils were found in a Belgian coal mine in 1878. More than 35 skeletons were excavated, greatly helping scientists develop a better understanding of the dinosaur.
Scientists estimate the Iguanodon’s maximum speed would have been around 24kph (15mph).
Sauropods first appeared on the scene in the Triassic Period (around 200 million years ago) and became quite common late in the Jurassic Period (around 150 million years ago).
Sauropod fossils have been found on every continent of Earth, even in Antarctica.