Physical DescriptionPachycephalosaurus are most widely known for their very thick skull roof. The bone on top of its head was close to ten inches thick, and was probably used for defence. Pachycephalosaurus would probably use the top of their head much like a modern day ram … [Read more...]
Extinct Animals
Extinct is a classification category on the International Union for the Conservation of Nature’s (IUCN) Threatened Species List.
Extinction occurs when a species — also called “taxon” for the list — no longer exists anywhere on earth.
When scientists have done extensive research and agree that there is no longer a single individual specimen of the species they declare it extinct. Essentially, extinction represents the termination of a taxon.
There are six main reasons why species become extinct:
- Habitat loss
- Introduction of a foreign species
- Hunting
- Pollution
- Disease
- Loss of genetic variation
Conservation Status List
- Extinct
- Extinct in the Wild
- Critically Endangered
- Endangered
- Vulnerable
- Near Threatened
- Least Concern
- Data Deficient
- Not Evaluated
Plesiosaurus
Physical DescriptionThe plesiosaurus was one of the largest aquatic animals and lived throughout the cretaceous period). It grew up to twenty three meters (75 feet) long, making it among some of the largest sea creatures. Like other sauropterygians it was a very successful … [Read more...]
Allosaurus
The Allosaurus has a name that literally means the 'different lizard.' Possibly this was due to the fact that the first bones were discovered during the bone wars between Edward Cope and Othniel Marsh during the late 19th century in Wyoming and Colorado. What started as … [Read more...]
Ankylosaurus
Physical DescriptionThe Ankylosaurus, was a very large dinosaur, potentially measuring up to 30 feet long, 6 feet wide, and about 4 feet high. The defining feature of an ankylosaurus however, is its armor. This hardened exterior consisted of very tough bones and scales … [Read more...]
Pterodactyl
Physical DescriptionPterodactyl basically meant 'winged lizard.' The term Dinosaurs refer to strictly to animals that walk on land, so technically the Pterodactyl is a mammal, but since it was a flying reptile during the time of dinosaurs it is good to understand the … [Read more...]
Spinosaurus
Physical DescriptionThe spinosaurus was the largest of all meat eating dinosaurs. They were roughly 50 feet long and 20 feet high, that is much bigger than the Tyrannosaurus Rex. They weighed up to possibly 18 thousand pounds.Their name comes from the giant spine that … [Read more...]
Triceratops
Physical DescriptionTriceratops literally means “three horned face.” They had two large horns on the top of their skull, and a final horn on the tip of its beak (much like that of a rhinoceros.) Behind the back two horns was a frill. This frill was much like a shield of bone … [Read more...]
Tyrannosaurus Rex
Physical DescriptionThe Tyrannosaurus Rex (T-Rex) was a giant animal. They were about 15 feet tall and 40 feet long. That is a little bit longer than a typical school bus. Tyrannosaurus Rexes were one of the largest land meat eating animals (carnivores) of all time. They had … [Read more...]
Velociraptor
Physical DescriptionThe velociraptor was a speedy meat eating dinosaur. They were about 6 feet long, 2 feet high, and weighed roughly 45 lbs (20 Kg). They had a unique S curve neck that would go out from the body and up to its head. The head, which is egg shaped, was … [Read more...]
Stegosaurus
Physical DescriptionStegosauruses were generally 30 feet long and about 15 feet high. They generally weighed around 6,000 pounds. They are very identifiable by the large shield shaped plates coming out of his back. The plates stagger from the left side of the dinosaur’s body … [Read more...]