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ACANTHOPHOLIS
ACROCANTHOSAURUS
ADASAURUS
AEGYPTOSAURUS
AEOLOSAURUS
AFROVENATOR
AGILISAURUS
ALAMOSAURUS
ALBERTOSAURUS
ALECTROSAURUS
ALGOASAURUS
ALIORAMUS
ALLOSAURUS
ALTISPINAX
ALVAREZSAURUS
ALXASAURUS
AMARGASAURUS
AMMOSAURUS
AMTOSAURUS
AMYGDALODON
ANATOTITAN
ANCHICERATOPS
ANCHISAURUS
ANDESAURUS
ANKYLOSAURUS
ANSERIMIMUS
ANTARCTOSAURUS
ANTRODEMUS
APATOSAURUS
ARALOSAURUS
ARCHAEOPTERYX
ARCHAEORNITHOIDES
ARCHAEORNITHOMIMUS
ARGENTINOSAURUS
ARGYROSAURUS
ARRHINOCERATOPS
ATLASCOPCOSAURUS
AUBLYSODON
AUSTROSAURUS
AVACERATOPS
AVIMIMUS
 
ANATOTITAN
Pronunciation: uh-NAT-uh-TYE-tan 
Translation: Giant Duck
Also known as: Anatosaurus
Description: Herbivore, mostly Bipedal, semi-Quadrupedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 13.1 -16.4 feet (4 - 5 meters)
Length: 29.5 - 39.4 feet (9 - 12 meters)
Weight: 6,600 - 8,800 lbs (3,000 - 4,000 kg)
Period: Late Cretaceous


Notes: This hadrosaur, or duck-billed dinosaur, was one of the last of the dinosaurs. Its most distinguishing feature was its unusually long and wide duckbill, toothless over half its length -- making its head more duck-like than most hadrosaurs.


ANCHICERATOPS
Pronunciation: ANG-kee-sair-a-tops 
Translation: Similar Horned Face
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height: 7 feet (2.1 meters)
Length: 16 feet (4.9 meters)
Weight: Period: Late Cretaceous


Notes: Anchiceratops was discovered in Alberta, Canada. Its massive head was crowned by a horny beak and three horns. A long bony frill covered its shoulders.


ANCHISAURUS
Pronunciation: ANG-kee-SAWR-us 
Translation: Near Lizard
Also known as: Yaleosaurus
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Prosauropoda
Family: Anchisauridae
Height: 3 feet (0.9 meters)
Length: 7.5 feet (2.4 meters)
Weight: 60 lbs (27 kg)
Period: Early Jurassic


Notes: Although discovered in Connecticut, Anchisaurus is believed to have ranged all over the world. This small sauropod walked on all four feet, but could stand on its hind feet when feeding. Its small slender head had teeth made for shredding leaves.


ANDESAURUS
Pronunciation: AN-dee-SAWR-us 
Translation: Andes (Mountains) Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height:
Length: 59 feet (18 meters)
Weight:
Period: Middle Cretaceous


Notes: Discovered in the Patagonia region of Argentina, Andesaurus resembles Camarasaurus. Itsrear vertebrae are distinctive, being nearly 2 feet (.6 meters) high.


ANKYLOSAURUS
Pronunciation: ang-KILE-uh-SAWR-us 
Translation: Fused Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Ankylosauridae
Height: 11 feet (3.4 meters)
Length: 35 feet (10.6 meters)
Weight: 10,000 lbs (4,536 kg)
Period: Late Cretaceous





Notes: The best known of the armored dinosaurs, Ankylosaurus was the last and largest of the ankylosaurids. Its tough skin was covered with bony plates, and it could swing its formidably clubbed tail to render a predator lame. This dinosaur is known from fossils found in Montana and Alberta.


ANSERIMIMUS
Pronunciation: AN-sair-uh-MYE-mus 
Translation: Goose Mimic
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria (of the microorder Coelurosauria)
Family: Ornithomimidae
Height:
Length: 9.8 feet (3 meters)
Weight:
Period: Late Cretaceous


Notes: Anserimimus was really more of an ostrich-mimic than a goose mimic, as its name translates. Its powerful forelimbs were stronger than other onithomimids. The arms and hands seem to indicate that Anserimimus dug for such food as small insects or dinosaur eggs.


ANTARCTOSAURUS
Pronunciation: ant-ARK-tuh-SAWR-us 
Translation: Southern Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height: 20 feet (6.1 meters)
Length: 59 feet (18 meters)
Weight: 80,026 -100,000 lbs (36,300 - 45,360 kg)
Period: Late Cretaceous


Notes: Found in both India and South America, Antarctosaurus is the largest dinosaur known to have lived in the Southern Hemisphere. It is also one of the few sauropods whose skull exists.


ANTRODEMUS
Pronunciation: an-tro-DEE-mus 
Translation: Strongly Framed
Also known as: Allosaurus
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Allosauridae
Height: 16.4 feet (5 meters)
Length: 39.3 feet (12 meters)
Weight: 8,000 lbs (3,630 kg)
Period: Late Jurassic


Notes: Scientists debate whether Antrodemus and Allosaurus are the same animal.


APATOSAURUS
Pronunciation: ah-PAT-uh-SAWR-us 
Translation: Deceptive Lizard
Also known as: Brontosaurus; Atlantosaurus
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Diplodocidae
Height: 30 feet (9.1 meters)
Length: 75 feet (22.9 meters)
Weight: 66,000 lbs (29,937 kg)
Period: Late Jurassic





Notes: Apatosaurus is one of the best known of all dinosaurs but usually by its more popular name "Brontosaurus". Its 20-foot-long neck supported a rather small head and its brain was about the size of a large apple. Two low ridges ran the length of its backbone, from the base of its skull almost to the tip of its tail. These spines supported the ligaments that held up the neck and tail. Apatosaurus' 30-foot whip-like tail was probably its only means of self-defense. This dinosaur lived in western North America, where most specimens have been recovered.


ARALOSAURUS
Pronunciation: ar-al-uh-SAWR-us 
Translation: Aral Lizard
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height:
Length:
Weight: Period: Late Cretaceous


Notes: Fragmentary remains of Aralosaurus were discovered in Kazakhstan. Very little is known of Aralosaurus; however, it did have different teeth in the upper and lower jaws, which identify it as a hadrosaur.


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