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Birds are avian dinosaurs, and in phylogenetic taxonomy their over 11,000 extant species are included in the group Dinosauria. Dinosaurs are a diverse group of reptiles [ note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the ...
Cultural depictions of dinosaurs have been numerous since the word dinosaur was coined in 1842. The non-avian dinosaurs featured in books, films, television programs, artwork, and other media have been used for both education and entertainment. The depictions range from the realistic, as in the television documentaries from the 1990s into the ...
Titanoboa ( / ˌtaɪtənəˈboʊə /; lit. 'titanic boa') is an extinct genus of giant boid (the family that includes all boas and anacondas) snake that lived during the middle and late Paleocene. Titanoboa was first discovered in the early 2000s by the Smithsonian Tropical Research Institute who, along with students from the University of ...
Megalodon teeth can measure over 180 millimeters (7.1 in) in slant height (diagonal length) and are the largest of any known shark species,[29]: 33 implying it was the largest of all macropredatory sharks.[35] In 1989, a nearly complete set of megalodon teeth was discovered in Saitama, Japan.
This "classic" period saw the emergence of Charles R. Knight, Rudolph Zallinger, and Zdeněk Burian as the three most prominent exponents of paleoart. During this time, dinosaurs were popularly reconstructed as tail-dragging, cold-blooded, sluggish "Great Reptiles" that became a byword for evolutionary failure in the minds of the public.
Velociraptor ( / vəˌlɒsɪˈræptər, vəˈlɒsɪræptər /; [ 1] lit. 'swift thief') is a genus of small dromaeosaurid dinosaurs that lived in Asia during the Late Cretaceous epoch, about 75 million to 71 million years ago. Two species are currently recognized, although others have been assigned in the past.
The Cretaceous ( IPA: / krɪˈteɪʃəs / krih-TAY-shəss) [ 2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the ...
The Mesozoic Era [3] is the penultimate era of Earth's geological history, lasting from about 252 to 66 million years ago, comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance of gymnosperms and of archosaurian reptiles, such as the dinosaurs; a hot greenhouse climate; and the tectonic break-up of Pangaea.