Ankylosaurus (/ˌæŋkəloʊˈsɔːrəs/ ANG-kə-lo-SAWR-əs) is a genus of armored dinosaur. Fossils of Ankylosaurus have been found in geological formations dating to the very end of the Cretaceous Period, between about 68–66 million years ago, in western North America, making it among the last of the non-avian dinosaurs.
Emily Willoughby. Archaeopteryx is the single most famous transitional form in the fossil record, but this bird-like dinosaur (or dinosaur-like bird) has mystified generations of paleontologists, who continue to study its well-preserved fossils to tease out hints about its appearance, lifestyle, and metabolism.
Giganotosaurus posed next to a human being (Sameer Prehistorica). Part of what has made Giganotosaurus so famous, so quickly, is the fact that it slightly outweighed Tyrannosaurus Rex: full-grown adults may have tipped the scales at about 10 tons, compared to a little over nine tons for a female T. Rex (which outweighed the male of the species).
Megalosaurus is the classic "wastebasket taxon"--for over a century after it was identified, any dinosaur that even vaguely resembled it was assigned as a separate species. The result, heading into the early 20th century, was a baffling bestiary of presumed Megalosaurus species, ranging from M. horridus to M. hungaricus to M. incognitus.
Parasaurolophus is a dinosaur that lived about 76 million years ago during the Late Cretaceous Period. It was first discovered in 1922 in Alberta, Canada by Dr. William A. Parks. He named it Parasaurolophus, a name which means “crested lizard”. A name he gave the animal because of its prodigious bony crest that exists on top of its head. Fossils of this dinosaur have not only been found in Canada, but has also been found in parts of Utah and New Mexico.
Troodon (/ˈtroʊ.ədɒn/ TROH-ə-don; Troödon in older sources) is a dubious genus of relatively small, bird-like dinosaurs known definitively from the Campanian age of the Cretaceous period (about 77 mya). It includes at least one species, Troodon formosus, is known from Alberta and Montana.
Tyrannosaurus Rex is by far the most popular dinosaur that ever lived, spawning a huge number of books, movies, TV shows, and even video games. What's truly amazing, though, is how much about this carnivore that was once assumed as fact has lately been called into question, and how much is still being discovered.