PHYSICAL DESCRIPTION The protoceratops was one of the smaller dinosaurs. They were about 3 feet tall and roughly 7 feet wide. They walked on four legs, which were all the same size. They had frills at the back of their neck. The protoceratops was a roughly light dinosaur at … [Read more...]
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
- Loss of genetic variation
Conservation Status List
- Extinct in the Wild
- Critically Endangered
- Near Threatened
- Least Concern
- Data Deficient
- Not Evaluated
PHYSICAL DESCRIPTION Pachycephalosaurus 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 defense. Pachycephalosaurus would probably use the top of their head much like a modern day ram … [Read more...]
PHYSICAL DESCRIPTION The plesiosaurus was one of the largest aquatic animals and lived throughout the cretaceous period). It grew up to twenty three meters long, making it among some of the largest sea creatures. Like other sauropterygians it was a very successful reptile that … [Read more...]
PHYSICAL DESCRIPTION Pterodactyl 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 Pterodactyl. … [Read more...]
Physical Description The 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...]
PHYSICAL DESCRIPTION Triceratops 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...]
Physical Description The 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 an … [Read more...]
Physical Description The velociraptor was a speedy meat eating dinosaur. They were about 6 feet long, 2 feet high, and weighed roughly 45 lbs. 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 generally 9 inches … [Read more...]
PHYSICAL DESCRIPTION Stegosauruses 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 to … [Read more...]
Quagga Zebra The Quagga zebra is an extinct subspecies of the Plains zebra, which was once found in great numbers in South Africas Cape Province and the southern part of the Orange Free State.The name comes from a Khoikhoi word (a historical division of the Khoisan ethnic group … [Read more...]