Dinosaur World

Extinct creatures: dinosaur names of alphabet letter A that will amaze you.

Extinct creatures such as dinosaurs are really hard to come by. Many scientists have put in their life work to finding and naming these magnificent creatures and as such making it possible to understand what came before us humans. Dinosaur discovery is an exciting topic to realize and wonder as to where these dinosaurs where really found and in what state they were fond. Many scientists have been in touch with these magnificent and beautiful extent creatures and in their findings can the world of dinosaurs be understood and told to the world, our world.

Extinct Creatures: Alphabets Of Letter A

  1. Albertosaurus

Albertosaurus come from the same dinosaur family as its better known as larger relative, tyrannosaurs. It lived before tyrannosaurus, and the two creatures are similar in several ways- both had large heads and tiny front arms. A noticeable difference between Albertosaurus and its close cousin tyrannosaurus is the position of its eyes. While the eyes of tyrannosaurus looked straight ahead, those of Albertosaurus were positioned at the side of its head. As a meat eater or carnivore, Albertosaurus was a hunter. It was a ‘land shark’ that preyed on slower- moving animals, such as duck- billed dinosaurs the size of a modern rhinoceroses. Their only chance of escape from the kicks and blows of its powerful legs would have been to out run it, or dive into thick vegetation for cover. In Canada, a group of Albertosaurus skeletons have been found close together in one place and it suggests it lived in herds with its fellow dinosaurs.  


In 1884 joseph Tyrrell led an expedition from the Canadian Geological Survey to explore part of Alberta, a vast area in the west of Canada. His team of scientists set out to make the first detailed maps of the region and to look for useful mineral deposits.  But as well as discovering vast deposits of coal, they found something totally unexpectant. On June 9, in the valley of the Red Deer River, Tyrrell discovered fossilized bones belonging to a large meat- eating dinosaur.

Although these were not the first dinosaur remains found in Canada (the first were found in 1874), they caused great excitement because they came from a previously unknown species. The new dinosaur was dinosaur was named Albertosaurus after the area in which it was found. Many other Albertosaurus fossils have since have found in Alberta, Canada and in the western USA.

Extinct Creatures:  Fast Facts About Albertosaurus.

Description; a bipedal carnivore. Order; Saurischia (‘lizard- hipped’). Name means; Alberta lizard. Period; Late cretaceous, about 70 million years ago. Location; USA, Canada. Length; 9 meters (30 feet). Weight; 2 tons

  1. Allosaurus

Allosaurus was one of the largest meat- eating dinosaurs of the Jurassic period. Until tyrannosaurus such as Albertosaurus and tyrannosaurus appeared some 50 million years later, Allosaurus was the largest predator on earth. Scientists used to think that the bulky body of Allosaurus was not built for high- speed chases. But this idea is now changing. The ribs of one Allosaurus are broken in several places and have healed, showing that the animal survived its injuries. So, maybe Allosaurus was a chaser after all, able to run after its prey and throw itself at its victims. When attracting a prey animal larger than itself, such as a Diplodocus, Allosaurus may have hunted in packs. Perhaps the packs single out a weak animal, separating it from rest of the herd before going in for the kill. At other times, Allosaurus may have hunted alone, ambushing smaller animals, such as stegosaurus.

Allosaurus dinosaur.


A well- preserved Allosaurus skeleton was unearthed in the Como Bluff area of Wyoming, USA, in 1879. It was packed up and sent to the American Museum of Natural History, New York, where it remained in storage until 1903. Only then were the boxes unpacked and the identity of the dinosaur became known. By then other Allosaurus skeletons had been found, the most complete of which was discovered in 1883 by a fossil collector, M.P. Felch, at canyon city, Colorado, USA.

Extinct Creatures:  Fast Facts Allosaurus.

Description; a bipedal carnivore.  Order; Saurischia (‘lizard- hipped’).  Name means; different lizard.  Period; Early Cretaceous, about 140 million years ago.  Location; North America. Length; 12 meters (39 feet). Weight; 2-5 tons.


  1. Ankylosaurus

Ankylosaurus belongs to a family of dinosaurs known as the ankylosauria. Their family name means ‘fused together lizards’, because of the plates of bony armor that were joined together over their bodies. Ankylosaurs were four- legged amour- plated dinosaurs with long, wide bodies. They ranged in length from 1 meter (3 foot) long Pinacosaurus to the giant of the group, the 10 meter long Ankylosaurus. It was the last member of its family of its family to evolve. It appeared in North America towards the very end of the Age of dinosaurs. Ankylosaurus was a slow moving animal, at risk of attack from meat eaters such as tyrannosaurus rex. Its body amour protected it from bites and it also swings its clubbed tail at an attacker. But, if Ankylosaurus was knocked over, its soft belly offered no protection against the bites, scratched and kicks of a predator.

Ankylosaurus dinosaur
Ankylosaurus dinosaur walking around it’s habitat.
Extinct Creatures:  Fast Facts About Ankylosaurus.

Description; a quadrupedal herbivore.  Order; Saurischia (‘lizard- hipped’).  Name means; stiff lizard.  Period; Late Cretaceous, about 70 million years ago.  Location; North America. Length; 10 meters (33 feet). Weight; 5 tons.

  1. Apatosaurus

Apatosaurus is the best known of all long- necked plant- eating dinosaurs. But there is still much that remains a mystery about this creature. For instance, it is not known for certain whether it lives alone or in herds. Apatosaurus was one of the largest creatures ever to live on Earth, measuring about 5 meters tall at the hips and over 20 meters from the nose to the tail. Much of its great length was taken by its long, slender tail and neck.

Apatosaurus dinosaur waking together.

Apatosaurus was given its name in 1877 after its bones were collected from the town of Morrison, Colorado, USA. Two years later, in 1879, bones from dinosaur were found in quarry at Como Bluff, Wyoming, USA. At the time no one realized that these bones also came from an Apatosaurus. Instead, the experts of the day thought they belonged to a new type of dinosaur and so they gave it the name Brontosaurus, meaning thunder lizard’.

As more bones were found, scientists realized that a mistake had been made and in 1903 the name Brontosaurus was dropped. According to the scientific rules, the animal had to be called by the name it was first given- it should only be known as Apatosaurus. But in 1905, when a complete Apatosaurus skeleton went on display at the American Museum of Natural History, it was mistakenly labeled as brontosaurus. The name stuck and for much of the twentieth century the so- called ‘thunder lizard” was the world’s most famous long-necked dinosaur.

Extinct Creatures:  Fast Facts About Apatosaurus.  

Description; a quadrupedal herbivore.  Order; Ornithischia (‘bird- hipped’).  Name means; deceptive lizard.  Period; Late Cretaceous, about 150 million years ago.  Location; North America. Length; 21 meters (69 feet). Weight; 30 tons.


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