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40 Dinosaurs Discovered in North America
Nedoceratops roaring while running among onychiopsis trees. Photo Credit: Elenarts/Shutterstock

29. Nedoceratops

The only evidence of Nedoceratops is a single skull uncovered in 1868 in Wyoming. Paleontologists believe that this dinosaur originated in the Late Cretaceous Period. An intense debate has been ongoing about this dinosaur. Many experts consider it is its own species, but others think that Nedoceratops is a growth stage of the Triceratops.

Although Nedoceratops resembles the Triceratops, there are some distinctions. Instead of having a nasal horn, Nedoceratops has a rounded snout. Its skull is larger than that of a Triceratops, but it has a shorter face. Nedoceratops has a frill, but its frill has large holes which some paleontologists think are from being gored by other dinosaurs. Like its relative Triceratops, Nedoceratops are herbivores.

40 Dinosaurs Discovered in North America
Ornithomimid dinosaurs from the Late Cretaceous Period. Photo Credit: YuRi Photolife/Shutterstock

30. Ornithomimus

Ornithomimus was discovered in the Denver Formation of Colorado in 1890. This theropod roamed North America during the Late Cretaceous Period more than 66 million years ago. The Ornithomimus dinosaur had long legs, long necks, and bird-like arms.

Ornithomimus was covered in feathers and had beaked skulls without any teeth. This dinosaur resembled the modern-day ostrich. Because they didn’t have any teeth, paleontologists believe Ornithomimus ate an omnivorous diet but favored plants. Their long limbs and hollow bones made them fast runners. Ornithomimus’ hands were curved, resembling a sloth’s claws, which made them ideal for hooking onto branches while they fed.

40 Dinosaurs Discovered in North America
A brown Pachycephalosaurus in a dense jungle. Photo Credit: Daniel Eskridge/Shutterstock

31. Pachycephalosaurus

This dinosaur gets its name from the Greek words for “thick-headed lizard.” Remains of Pachycephalosaurus were found as far back as 1859 in Wyoming, Montana, and South Dakota. The Pachycephalosaurus lived in North America during the Late Cretaceous Period.

Although only Pachycephalosaurus skulls have been discovered, paleontologists have a rough idea of what the dinosaur looked like. Its most popular feature is the bony dome on its head that could be up to ten inches thick. This feature was ideal for protecting the dinosaur’s small brain. Additional protection was provided by short spikes on the back of the head. Pachycephalosaurus had a small muzzle with tiny teeth, perfect for eating its herbivorous diet.

40 Dinosaurs Discovered in North America
Pectinodon: “Comb tooth” Late Cretaceous, North America. Photo Credit: Wikimedia Commons

32. Pectinodon

Pectinodon roamed North America more than 66 million years ago during the Late Cretaceous Period. The only evidence of this dinosaur that paleontologists have discovered is its teeth. The name Pectinodon comes from the Latin words for “comb” and “tooth,” referring to the teeth’s serrated edges.

This biped was believed to have strong hind legs and weaker forearms. Pectinodon was a member of the troodontid family like Latenivenatrix, making it a small, bird-like dinosaur. It was roughly seven feet long and three feet tall. Experts believe this carnivore weighed about 110 pounds. Their teeth resemble those of an iguana, making them ideal for chewing meat.

40 Dinosaurs Discovered in North America
Rubeosaurus Dinosaur. Photo Credit: Wikimedia Commons

33. Rubeosaurus

Rubeosaurus gets its name from the Greek words “bramble lizard.” This dinosaur was discovered in the upper Two Medicine Formation in Montana. The Rubeosaurus lived in North America during the Late Cretaceous Period, more than 74 million years ago.

The first Rubeosaurus fossils were found in 1928. This giant dinosaur was nearly twenty feet long and weighed up to six tons. This dinosaur walked on all four legs and ate a plant-based diet. Rubeosaurus resembled the Triceratops in that it had a large skull with a frill and horns. Its snout featured a prominent horn that was several feet long.

40 Dinosaurs Discovered in North America
3D illustration of Dinosaur Sauropelta. Photo Credit: Michael Rosskothen/Shutterstock

34. Sauropelta

Sauropelta, which means “lizard shield,” is a nodosaurid dinosaur from the Early Cretaceous period. This dinosaur lived in North America during the Early Cretaceous Period nearly 110 million years ago. Many Sauropelta fossils have been found in the United States, especially in areas of Utah, Wyoming, and Montana.

Sauropelta is unique because its long tail accounts for roughly half of its body length. It can measure up to around seventeen feet long. The Sauropelta is a heavy creature, weighing more than three thousand pounds. This dinosaur is so massive because of bony armor that covers its body, including large spikes on its neck. Sauropelta thrived in areas that had a warm climate throughout the year and stuck to a herbivorous diet.

40 Dinosaurs Discovered in North America
North American Talos sampsoni Dinosaur. Photo Credit: Wikimedia Commons

35. Talos

Also known as Talos sampsoni, this dinosaur is a troodontid that lived in North America during the Late Cretaceous Period. Talos lived here roughly 76 million years ago. This dinosaur was discovered in Utah in 2008.

Like other troodontids, Talos was small, graceful, and bird-like. They had thin snouts with a large number of teeth. Talos’ feet had sharp claws, and their arms were wing-like. These dinosaurs were roughly six feet long and weighed over eighty pounds. Based on their teeth and sickle-like claws, Talos was a carnivore and a swift killer. Talos lived in wet, humid climates surrounded by rich, diverse fauna.

40 Dinosaurs Discovered in North America
Life restoration of Tawa hallae. Photo Credit: Wikipedia

36. Tawa

The Tawa was named after the Pueblo sun god and lived in North America during the Late Triassic Period. Fossils were discovered in New Mexico in 2004, but it was formally classified in 2009. The discovery of Tawa supports the theory that the earliest dinosaurs originated in what’s now South America and migrated from there around the world.

The Tawa dinosaur was just over eight feet long and weighed about thirty-three pounds. In comparison with other early dinosaurs, Tawa was much more slender. Tawa thrived in a warm climate with heavy precipitation. Their small stature made them fast and adept at hunting. Tawa had air sacs surrounding their necks and brains, much like modern birds.

40 Dinosaurs Discovered in North America
Theiophytalia in sleep posture. Photo Credit: YuRi Photolife/Shutterstock

37. Theiophytalia

Roughly 112 million years ago, Theiophytalia lived in North America during the lower Cretaceous period. This dinosaur was discovered in the Morrison Formation of Colorado in 1878. Theiophytalia gets its name from the Greek words for “divine” and “garden.” The park where the only Theiophytalia fossil was found is known as Garden of the Gods.

Theiophytalia is an Iguanodontian dinosaur, one of the first species to be discovered. Because of the various dinosaur species in this clade, Iguanodontia is one of the most known classifications of dinosaurs. This dinosaur has a broad, long snout and a bulbous lower jaw. They walked on their stout back legs and had shorter, thinner arms. Theiophytalia dinosaurs were herbivores.

40 Dinosaurs Discovered in North America
3D illustration of Triceratops from the Cretaceous era. Photo Credit: Warpaint/Shutterstock

38. Triceratops

The most well-known dinosaur on this list has to be the Triceratops. This dinosaur lived in North America during the Late Cretaceous Period roughly 68 million years ago. The Triceratops gets its name from the Ancient Greek words for “three-horned face.” Triceratops is unique in that it is one of the last known dinosaur species that are not related to birds.

The first Triceratops fossil was uncovered in Denver, Colorado in 1887. Triceratops is known for the large frill and three horns on the top of its skull. Its stocky four-legged body closely resembles the modern rhinoceros. These large animals could be upwards of thirty feet long and ten feet tall. Triceratops was extremely heavy, weighing between 13,000 and 26,000 pounds. Because their heads were low to the ground, paleontologists believe that these herbivores feasted on low-growing plants.

40 Dinosaurs Discovered in North America
Zapsalis dinosaur. Photo Credit: Dinosaur Database [CC-BY-SA]

39. Zapsalis

Discovered in the Judith River Formation area of Montana in 1876, Zapsalis was a theropod dinosaur. This species lived in North America approximately 75 million years ago. Evidence of the Zapsalis was found only in teeth fossils.

The name Zapsalis comes from the Greek words for “thorough” and “pair of scissors.” The Zapsalis teeth found in Colorado are classified by vertical grooves, straight rear edges, and a round shape. Based on these teeth, Zapsalis had stout, boxy skulls and heavy legs. These dinosaurs were built for strength more than speed. Their sharp, powerful teeth also indicate that Zapsalis were carnivores.

40 Dinosaurs Discovered in North America
Life restoration of Zuul crurivastator. Photo Credit: Wikimedia Commons

40. Zuul

Zuul, comically referred to as the “Destroyer of Shins,” was found in the Judith River Formation in Montana. Paleontologists uncovered Zuul’s complete skull and tail in 2017, making it the first of its kind to be discovered from these types of remains. The Zuul dinosaur lived in North America during the Late Cretaceous period roughly 75 million years ago. If the name sounds familiar, you’re right! It’s based on the villain Zuul from the movie Ghostbusters because they look similar.

This giant dinosaur was about twenty feet long and weighed more than two tons. Zuul was a fierce fighter based on heavy armor all over its body, including its head and tail. This dinosaur also had horns all along the back of its head to protect its skull. Zuul’s skull was about twenty inches long, making this one big-headed dinosaur. Although its tough exterior makes it ideal for hunting prey, Zuul was a plant-eater.

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