|Albertasaurus 70 Million BC/29 Feet long/1.8 Tons|
The Albertasaurus, despite the
size of it, is a relative of the T-Rex. It would use its powerful jaws to deliver a
fatal bone-crushing bite to the neck of its victim. Just like the T-rex, its larger
cousin, it has two tiny forearms used to hold its prey while ripping it apart. The
Albertasaurus has a mouth full of large serrated teeth.
|Baryonx 120 million BC/26 ft./2 tons|
Baryonx was possibly the only known fishing dinosaur. Its nostrils
were set back from the tip of its crocodile-like snout, probably so that it could stick
its nose in the water and still breathe. It had twice as many teeth as most
dinosaurs-probably perfect to catch fish.
Baryonx means "heavy claw". This dino gets its name from
its two massive front claws each more than a foot long.
Coelophysis 220 Million BC/10
It's sleek body was built for speed as it hunted in it's pack of
dinosaurs. The Coelophysis has razor edged teeth and it's legs are nearly hollow which
reduces weight and allows more speed. In 1947 a large amount of coelophysis' were found in
|Dilophosaurus 203 million/20 ft./1000 lbs.|
Dilophosaurus was one of the 1st terrible carnivores, found in
Arizona. It was mainly like other meat eaters. It was fast and ran on 2 feet, and had
sharp teeth. But some parts of it were strange.
It had 2 crests on its head from eyes to snout. Some scientists think they were used to
make their heads appear larger and frighten other dinosaurs. Also, their teeth were
slender and their jaws weren't too strong. Because of this, scientists believe they
either slashed their prey repeatedly or were scavengers.
|Edmontosaurus 75 Million BC/43 Feet/2.9-3.9 Tons |
Edmontosaurus was one of the largest of the duckbilled hadrosaurs in
the forests of western North America. It was 43 ft. long and had a bill much like a
duck's. While its bill was quite toothless,Its inner jaw contained tons of teeth. These
teeth were perfect for grinding up plants and tough vegetation. When they wore down, new
teeth would grow in their place suprisingly fast. Edmontosaurus probably had more than
1,000 teeth in its mouth all the time. Its jaw was similar to that of Iguanadon. Both
dinosaurs could move their jaws from side to side, making it easier to grind the tough
plants that they ate.
One of the strangest things about this dinosaur was its huge
nostrils. Paleontologists believe that these nostrils could have been covered with flaps
of loose skin. This skin could have been inflatable, allowing the Edmontosaurus to make
loud, bellowing noises. These inflatable nostrils could also have been brightly colored
and used during mating season, or as a way for Edmontosaurus' to recognize each other.
This dino's name means "Fabre's Lizard."It had strong
limbs to run well.It had strong teeth too. Holes in the jaw suggested old teeth were
replaced with new ones.
Gallimimus 13ft./South Mongolia
The Gallimimus is called "hen mimic"
and is probably the largest ostrich dinosaur.It probably ate by
scraping soil to get to eggs. This resulted of difficulty of picking up things.
|Hypsilophodon 8 Ft |
Hypsilophodon had large eyes,
cheeks to hold food as they chewed, and teeth that sharpened and replaced themselves as
they wore out. They had five fingers on their hands and four toes on their feet. These
two-legged dinosaurs were very speedy. They were herbivores and are believed to have been
the ancestors of the Iguanadons and the Hadrosaurs. They replaced the Fabrosaurs, which
died out near the end of the Jurassic Period. Hypsilophodons were herd animals.
|Iguanodon 29 Feet/5 Tons |
Iguanodons had long heads
with toothless beaks for clipping plants, and rows of teeth for grinding them.
They were heavily built so in most cases they probably walked on all four
feet, though they could rear up to reach food or defend themselves. They probably moved
slowly since the bones of their upper legs are longer than the bones of their lower legs,
just the opposite of fast moving animals. On their front feet they had big spikes that
would have been good for fighting off rivals or hungry meat-eaters.
|Jaxartosaurus 30 ft|
Jaxartosaurus, which means "Jaxarte's lizard", had a
duck-bill. Only an incomplete skeleton has been found so far. It had a wide head and was a
plant-eater of the late Cretaceous.
Kakaru means "rainbow serpent" and was named that because
of a leg bone shaped like an opal. It resembled a small bird, though, and did not
look like a snake. It was a meat eater.
|Lambeosaurus 30 ft/2.4 tons|
Lambeosaurus had a duckbill, squarish crest, and a horn behind that. It had hooves and
walked on all fours. Its name means "Lambes lizard".
|Maiasaura 30 Feet/3.2 Tons |
Maiasaura has given scientists new insight into the social behavior
of dinosaurs. It turns out the duck-billed Maiasaura liked to hang out together and take
care of their young. There are two major clues scientists have used to come to these
conclusions. One is a vast boneyard that scientists have discovered. The area is filled
with as many as 10,000 skeletons Maiasaura. Also, these skeletons range from about 10
feet long to 23 feet long, suggesting this herd was made up of different age dinosaurs.
Apparently they died from the smoke, fumes and ash of a volcano. This is significant
because it shows Maiasaura was not a loner, but lived together in herds. Another find in
Montana was a nest of 15 baby Maiasaura. The babies were three times the size they were
when they were born. Why weren't these dinosaurs out on their own? Most reptiles are
ready to face the world the moment they are born. There are two possible answers, and both
suggest these dinosaurs had a strong family relationship. Either the parents brought food,
or the young dinosaurs went out for food and then returned to the nest. No wonder
Maiasaura means "good mother lizard."
The Nodosaur family lived throughout the end of the
Jurassic period and throughout the Cretaceous
period. These dinosaurs were plant eaters with nodes covering
their skin and spikes coming off their sides. They had narrow heads, leaf-shaped teeth and
a strong, hard beak. If a meat eater came along, they probably protected themselves
by crouching on the ground.
|Oviraptor 6 ft/225 lbs.|
Oviraptor means, "egg thief". It had a
short head and strong, toothless jaws shaped like a beak. It also had a crest on its nose.
|Parasarolophus 33 ft/4 tons|
Parasarolophus had a six-foot long crest on its head that was
strong, but hollow. It might have been used in mating or as a trumpet. They might have
used it as ID, too.
|Quetzalcoatlus 50 Feet/190 Pounds |
Until recently, the giant-winged
pteradon was thought to have been the largest of the flying reptiles known as
"pterosaurs." But in 1972 the remains of an even more enormous
pterosaur was discovered in Texas. Quetzalcoatlus, or "feathered serpent"
-- named after an Aztec god -- was the largest and heaviest flying reptile by far. The
remains indicate that this giant pterosaur would have weighed nearly 190 pounds and had a
wingspan of close to 50 feet!
This reptile probably lived far
inland, away from water. Like other pterosaurs, Quetzalcoatlus' wings were made of skin
stretched along the lengths of greatly elongated fourth fingers of each claw. Scientists
think Quetzalcoatlus had excellent vision and behaved like a modern vulture. Using the
latest aircraft technology, Paul MacCready created a mechanical Quetzalcoatlus. This
pterosaur was filled with electromechanical and electronic devices to control its flight.
The new Quetzalcoatlus was patterned after the earlier version. Though controlled from the
ground, the robot also had sophisticated internal electronics to steady it while in
|Rhabdodon 13 Ft/320 lbs. |
Rhabdodon was a plant-eater. It was a member of
either the Hypsilophodon or Iguanodon families. Rhabdodon was an ornithopod, a group of
small bipedal herbivores, which include Lesothosaurus, Hypsilophodon and Dryosaurus.
|Stegoceras 6 ft/120 lbs.|
The Stegoceras was built almost entirely for ramming dinosaurs with
its head. It had a dome-shaped head and was a pachycephalosaur. Its massively dense skull
was probably used to butt heads with other males in its group.
|Troodon 8ft/210 lbs.|
This dinosaur was the smartest of all. Its name means,
"wounding tooth" because it was known for a single tooth. Later it was
found that it had different kinds of teeth. It's head was like birds, eyes faced
forward. Its thumbs worked like ours.
|Ultrasaurus" 98 Ft/130 Tons|
In 1979, James Jensen made an amazing, yet
frustrating, discovery. He unearthed one of the largest dinosaur legs ever known to man.
Unfortunately, that was all he found. Belonging to the same family as Brachiosaurus and
Apatosaurus, this giant plant-eater could have measured up to 98 feet in length and
weighed an enormous 130 tons, making it the largest land animal ever! Its front leg alone
is about a third larger than that of Brachiosaurus. Some day we may find the rest of
|Velociraptor 6 Feet/213 Pounds |
Velociraptor means "speedy plunderer," and this dinosaur was obviously built to
be fast.This dinosaur was lightweight with long back legs for running, a stiff tail for
balance, needle-sharp teeth and a fairly large brain. Like Deinonychus, the middle toe of
each hind foot had a large claw that was used for slashing its prey. Some scientists think
this fearsome dinosaur hunted in packs, maybe killing dinosaurs much larger than
themselves by grabbing them with their front claws and slashing their bellies with their
back. A human being could have been torn apart in 3seconds by a pack of Velociraptors.
|Wannanosaurus 2 ft
Wannanosaurus was a tiny dinosaur. It was a very primitive
Pachycephalosaur. The homalocephalids had thick, but flat-topped skulls. It was an
herbivore that walked on two strong legs. Wannanosaurus may have been a herding dinosaur
that lived in small groups in coastal and upland regions. Running was probably the first
line of self-defense. Wannanosaurus' thick skull may have been used for ramming rivals
during mating and dominance combat, for attracting mates, and as a last-ditch self-defense
|Xiaosaurus 5 ft.|
Xiaosaurus was a small dinosaur. It was a fast runner. It was small
and lizard-like. It walked on two long legs, had four-toed feet, five-fingered hands, and
a small head with large eyes. It had leaf-shaped cheek teeth.
|Yunnanosaurus 18-25 Feet/3 Tons |
Yunnanosaurus, named for Yunnan (where it was found),
is very interesting because its teeth are like those of a different dinosaur. This
dinosaur had four legs, a long neck, and ate plants. But while Yunnanosaurus was a
prosauropod, its teeth were those of a sauropod, such as Brachiosaurus. Not only were its
60 (or more) teeth shaped like those of a sauropod, but they even wore down like those of
|Zigongosaurus 35 ft/20 tons|
Zigongosaurus was a large quadrupedal herbivore. It had a long neck,
a long tail, a small head with spoon-shaped teeth, and thick, elephant-like legs.