OHMDENOSAURUS
OMEISAURUS
OPISTHOCOELICAUDIA
ORNITHOLESTES
ORNITHOMIMUS
ORODROMEUS
OTHNIELIA
OURANOSAURUS
OVIRAPTOR
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OHMDENOSAURUS
Pronunciation: OHM-den-o-SAWR-us 
Translation: Ohmden's Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Vulcanodontidae (not confirmed)
Height:
Length: 13 feet (4 meters)
Weight:
Period: Early Jurassic
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Notes: One of the earliest known sauropods, Ohmdenosaurus
is known from fragmentary remains discovered in Germany.
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OMEISAURUS
Pronunciation: o-MY-ee-SAWR-us
Translation: Omei Lizard
Also Known As: Zigongosaurus
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Euhelopodidae (not confirmed)
Height: 30 feet (9.1 meters)
Length: 66 feet (20.1 meters)
Weight:
Period: Late Jurassic
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Notes: Like Mammenchisaurus, Omeisaurus had an extremely
long neck. Because large numbers of this dinosaur were discovered
in close proximity, it may be that Omeisaurus traveled in herds.
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OPISTHOCOELICAUDIA
Pronunciation: o-piss-tho-SEE-luh-caw-dee-uh
Translation: Behind Hollow Tail
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Camarasauridae
Height: 16 feet (4.9 meters)
Length: 40 feet (12.2 meters)
Weight:
Period: Late Cretaceous
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Notes: Opisthocoelicaudia was found in the Gobi desert in a
remarkable state of preservation. A mid-sized sauropod, it had
forelegs and hind legs of nearly equal length and a short tail.
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ORNITHOLESTES
Pronunciation: or-nith-o-LESS-teez
Translation: Bird Robber
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Family:
Height: 3 feet (0.9 meters)
Length: 6 feet (1.8 meters)
Weight: Period: Late Jurassic
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Notes: Found in Wyoming and Utah, Ornitholestes was a swift,
small-headed, long-tailed dinosaur that ate lizards and other small
game that it caught with its long fingered hands.
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ORNITHOMIMUS
Pronunciation: or-nith-uh-MY-mus
Translation: Bird Mimic
Also Known As: Coelurosaurus
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria (of the microorder Coelurosauria)
Family: Ornithomimidae
Height: 9 feet (2.7 meters)
Length: 15 feet (4.6 meters)
Weight: 300 pounds (136 kg)
Period: Late Cretaceous
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Notes: Ornithomimus has been discovered in many sites in the
western United States and Canada. Ornithomimids closely
resembled the modern ostrich. Although its head was small,
Ornithomimus possessed a large braincase and is considered
to be one of the most intelligent of the dinosaurs.
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ORODROMEUS
Pronunciation: OR-uh-DROH-mee-us
Translation: Egg (mountain) Running Race
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height:
Length: 8 feet (2.5 meters)
Weight:
Period: Late Cretaceous
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Notes: Orodromeus eggs, embryos, and babies were discovered
in Montana. These rare finds provide insight into the way in which
dinosaurs laid their eggs and cared for them, as well as how the
embryos developed and were nutured after they hatched. Like
Maiasaura young, Orodromeus hatchlings were cared for by their
parents until they were old enough to fend for themselves.
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OTHNIELIA
Pronunciation: oth-NEEL-ee-ah
Translation: Named after Othniel Charles Marsh,
American paleontologist
Also Known As: Laosaurus
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height: 2 feet (0.6 meters)
Length: 4.6 feet (1.4 meters)
Weight:
Period: Late Jurassic
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Notes: Found in Utah, Wyoming and Colorado, Othnielia
had a small head and large eyes. Its beak-like jaws were lined
with teeth which were enameled on both sides.
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OURANOSAURUS
Pronunciation: ooh-RAN-uh-SAWR-us
Translation: Valiant Lizard
Also Known As:
Description: Herbivore,Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Iguanodontidae
Height: 10 feet (3.1 meters)
Length: 23 feet (7.0 meters)
Weight: 8,000 pounds (3,629 kg)
Period: Early Cretaceous
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Notes: Ouranosaurus was found in the Sahara Desert of
Niger, Africa. Related to the Iguanodon, but unlike Iguanodon,
Ouranosaurus had very high spines in its vertebrae that ran down
the middle of its back and tail. These spines may have supported
a sail or fin that helped keep it from overheating. It resembled
a contemporary theropod, Spinosaurus.
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OVIRAPTOR
Pronunciation: o-vih-RAP-tor
Translation: Egg Thief
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Maniraptora (of the microorder Coelurosauria)
Superfamily: Oviraptorosauria
Family: Oviraptoridae
Height: 3 feet (0.9 meters)
Length: 5 feet (1.5 meters)
Weight: 80 pounds (36 kg)
Period: Late Cretaceous
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Notes: Found in southern Mongolia, Oviraptor received its name,
"Egg Thief," from the fact that it was found atop a clutch of eggs
that were believed to be those of Protoceratops.With the
discovery of an egg with an Oviraptor embryo in it, the eggs
attributed to Protoceratops belong to Oviraptor. Moreover, a few
new specimens show skeletons of Oviraptor crouching over
clutches of these eggs. Instead of stealing the eggs, it seems likely
that Oviraptor was trying to protect the nests, not plunder them.
Oviraptor had long, slender legs and huge hands with three long,
slender fingers. Although it possessed no teeth, Oviraptor's clawed
hands argue for its predator status.
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