Acrocanthosaurus was a large, meat-eating dinosaur. Acrocanthosaurus means "high-spined lizard." No one knows what color this, or any dinosaur, was.

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Acrocanthosaurus was a large, meat-eating
dinosaur. Acrocanthosaurus means "high-spined
lizard." No one knows what color this, or any
dinosaur, was. Anatomy Acrocanthosaurus was
30-40 feet (9-12 m) long and weighed about 5,000
pounds (2300 kg). This theropod dinosaur had a
big head, with a 4.5-foot (1.4 m) long skull and
68 thin, sharp, serrated teeth. It had 17-inch
(43 cm) spikes extending from its vertebrae along
the neck, back, and tail. These spikes may have
been covered with skin, forming a thick, fleshy
sail along its back. This predator had powerful
arms each hand had three fingers equipped with
long, sickle-like claws. When it Lived
Acrocanthosaurus lived during the early
Cretaceous period, about 115-105 million years
ago. Fossils Acrocanthosaurus fossils have been
found in Oklahoma, Texas, and Utah (in the USA).
Many fossilized tracks have also been found.
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Seismosaurus was an enormous, long-necked,
whip-tailed, small-headed dinosaur. It measured
about 130-170 feet (39-52 m) long and was roughly
18 feet (5.5 m) tall (measured from the ground to
the top of the shoulder). This giant may have
weighed about 30 tons (roughly 60,000 pounds). It
was among the longest land animals that ever
lived. Seismosaurus lived during the late
Jurassic Period, from 156-145 million years ago.
Diet Seismosaurus was an herbivore (it ate only
plants). Seismosaurus fossils have been found in
New Mexico, USA.
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ANATOMY Lambeosaurus was a crested, duck-billed
dinosaur. Its forward-leaning, hollow, bony crest
was as big or bigger than the rest of its skull
and may have been used to produce sounds, enhance
its sense of smell, and/or used in courtship
displays. Lambeosaurus grew to be about 30-50
feet long (9-15 m), weighing 5.6 tons. It is the
largest-known duck-bill dinosaur. WHEN
LAMBEOSAURUS LIVED Lambeosaurus lived during the
Cretaceous period, about 83 to 65 million years
ago, at the end of the Mesozoic, the Age of
Reptiles. LOCOMOTION Hadrosaur
footprint.Lambeosaurus walked and ran on two
legs, and was a relatively fast dinosaur. It
probably went on all fours to forage for plants.
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Vulcanodon (pronounced vul-KAN-uh-don) was a
long-necked dinosaur that lived during the early
Jurassic period, about 208 to 201 million years
ago. It was a very early sauropod (a
vulcanodontid). Anatomy Vulcanodon was about 20
feet (6.5 m) long. It was a long-necked,
long-tailed plant-eater with a small head, thick
legs, and a bulky body. It had nail-like claws on
its feet and an enlarged claw on each big toe.
Its front legs were relatively long. Name
Vulcanodon means "Vulcan tooth." Vulcan was the
Roman god of fire.
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Pentaceratops was a rhinoceros-like plant-eating
dinosaur. It walked on four sturdy legs and had
three horns on its face along with a large bony
plate projecting from the back of its skull (a
frill). Pentaceratops lived during the late
Cretaceous period, about 75-65 million years ago.
Anatomy Pentaceratops had a beak, a snout horn,
and two long brow horns. It also had two
enlarged, horn-like cheekbones that protruded
from its face. It had a very large skull, 9.8
feet (3 m) long, with a very large, bony,
scalloped, head frill. Pentaceratops was up to
28 feet (8 m) long.
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Chasmosaurus was a horned, frilled, plant-eating
dinosaur that lived during the late Cretaceous
period, roughly 76 to 70 million years ago.
Chasmosaurus means "chasm lizard," referring to
holes in its frill. Anatomy This ornithischian
(bird-hipped) dinosaur had a bulky body, a very
long skull with a frill (5 feet or 1.5 m long), a
toothless beak, blunt cheek teeth, and a short
tail. The openings in the bone of the frill were
large, indicating that the frill was used more as
a display than as a defense. Chasmosaurus was up
to 16-26 feet tall (5-8 m) long. It weighed
roughly 3.5 tons (3220 kg). Fossils
Chasmosaurus was named in 1914 by Canadian
paleontologist Lawrence Lambe. T
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Megaraptor was a large, meat-eating dinosaur with
a long, sickle-shaped claw on each foot. This
fast-running predator lived during the late
Cretaceous period, about 90-84 million years ago.
Anatomy The second toe on each foot had a
14-inch (35 cm) sickle-like claw, and the other
toes had smaller claws. When alive, this claw
would have been sheathed in a horny, keratinous
material much like our fingernails, making the
claw even bigger, longer and sharper. The long
tail was used for balance and for fast turning
ability. It had a relatively large brain and
large, keen eyes. Megaraptor was about 20-26 feet
(6-8 m) long.
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Maiasaura was a large, plant-eating, duck-billed
dinosaur. Maiasaura was the first dinosaur that
was found alongside its young, eggs, and nests.
This suggests that Maiasaura nurtured its young.
The nests were holes scooped out of the ground,
about 6-7 feet in diameter (1.8-2 m), and they
contained up to 25 grapefruit-sized eggs each.
Maiasaura lived during the late Cretaceous
period, about 80 to 65 million years ago. A
Maiasaura bone fragment and a piece of eggshell
from Maiasaura flew with astronaut Loren Acton on
an 8-day mission (Spacelab 2) in 1985. This was
the first dinosaur in space. Fossils and Name
Maiasaura means "Good Mother Lizard". This
dinosaur was first discovered in Montana, USA.
Thousands of Maiasaura fossils have been found in
western Canada and the United States. Adults,
hatchlings, juveniles, nests, eggs and embryos
have been found.
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