Fossilized remains of a gargantuan plant-eating dinosaur, the second most massive animal ever to walk the Earth, were unearthed in a desert oasis in Egypt in 2001, at a site that eons ago was a lush coastal paradise according to researchers. The discovery of a partial skeleton of Paralititan stromeri is shown in this illustration. Reuters
Yutyrannus huali and other smaller dinosaurs are depicted roaming 125 million years ago, in this artist's rendering provided by the Beijing Institute of Vertebrate Paleontology and Paleoanthropology. The earlier relative of T. rex had a feathery coat, suggesting that the king of dinosaurs may have also been fuzzy, according to a report in the journal Nature. Brian Choo/Beijing Institute of Vertebrate Paleontology and Paleoanthropology/AP
Workers move a giant Tyrannosaurus Rex model into position at Chester Zoo in Chester, northern England, on March 12, 2012. The robotic model is one of 19 replica dinosaurs that form the Dinosaurs Bite Back exhibition that opens at the zoo April 1. Phil Noble/Reuters
A full-scale replica of the prehistoric snake 'Titanoboa' swallowing a crocodile had a preview at Grand Central Station in New York City in March 2012. An exhibit at the Smithsonian’s Museum of Natural History in Washington, D.C., features the 48-foot-long, 2,500-pound snake, which lived more than 60 million years ago, after dinosaurs ruled. Bebeto Matthews/AP
In the Jurassic era, even the measly flea was a beast. It was a super-size bloodsucker that feasted on dinosaurs using a saw-like siphon. This undated photo provided by Nature shows the male flea from the early Cretaceous period. D. Huang/Nature/AP
A skeleton of a Tarbosaurus dinosaur is displayed as part of an exhibition entitled 'Dinosaurs, treasures of Gobi desert,' at CosmoCaixa in Alcobendas, near Madrid, March 17, 2010. Juan Medina/Reuters
A dinosaur replica of the Iguanodon is part of the exhibition 'Dinosaurs of Peru,' at the Kennedy Park in the Miraflores district of Lima in September 2011. The exhibition featured various dinosaur species that inhabited Peruvian territory during the Mesozoic Era (or Age of Reptiles). Mariana Bazo/Reuters
The skeleton of a Prosaurolophus maximus, a dinosaur that measured more than 11 meters long, was displayed at Sotheby's auction house in Paris, Oct. 7, 2011.
An animatronic model of an Allosaurus performed during a media call show of the production "Walking with Dinosaurs" in Sydney January 10, 2007. Tim Wimborne/Reuters
An artist's impression shows the 15 metre (50 ft) long "sea monster" found in Arctic Norway, the biggest of its kind known to science. With dagger-like teeth in a mouth large enough to bite a small car, the 150-million year old dinosaur-era pliosaur was a fierce marine reptile. Natural History Museum/University of Oslo/Reuters
Pranom Ketmanee from Thailand swept the floor between two Pachycephalosaurus dinosaurs at the Singapore Science Center October 27, 2000. The 'Dinosaur Live' show featured 40 animatronic dinousaurs from the U.S. Simon Thong/Reuters
An animated Lilliensternus (c. )and two Utahraptors starred in "Walking with Dinosaurs The Live Experience" in Sydney, Australia, Thursday, Dec. 21, 2006. Paul Miller/AP
Discovered by an Italian shoemaker, a close-up of one of the best-preserved dinosaur fossils. Officially named Scionyx Samnitcus, the impression shows muscles, intestines, teeth, traces of windpipe and is believed to be part of a newly discovered species related to the powerful flesh-eater Tyrannosaurus Rex and the Velociraptor. Stefano Rellandini/Reuters
Australian Sam Kotzur, 3, from Sydney poses with a model of a giant crocodile at the creature's exhibit unveiling at the Australian Museum in Sydney September 3, 2003. Nicknamed "SuperCroc", sarchosuchus imperator (flesh crocodile emperor) which was 11 metres long, had jaws with over 100 teeth, lived on earth 110 million years ago and is possibly one of the largest crocodilians ever known to exist, scientists said. The creature's skull was found in the Sahara Desert in the year 2000. Will Burgess/Reuters
The eyes of a Tyrannosaurus rex replica named Kokoro is pictured during a media preview of the "Playing with Dinosaurs" exhibition at the National Chiang Kai-Shek Memorial Hall in Taipei December 7, 2009. Nicky Loh /Reuters
Sauropod dinosaurs, an order of vertebrate herbivores, had multiple reserve teeth in their tooth sockets to continuously replace failing teeth.
Selling a toothbrush to a dinosaur would be a hard pitch.
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