76. Euparkeria capensis.
Skull and partial skeleton of a small archosaur, the earliest known semi-bipedal animal, a swift predator and direct ancestor of dinosaurs, crocodiles, birds, and the extinct flying reptiles. Early Triassic, South Africa. South African Museum. 

186. Eoraptor lunensis.
Skull of the “dawn raptor”, the earliest known dinosaur, an efficient, bipedal predator whose primitive jaws lacked the flexibility of its carnivorous successors. Triassic, Argentina. The Argentine Museum of Natural Sciences.

187. Herrerasaurus.
Skull of the early dinosaur, a primitive, bipedal carnivore with a flexible jaw capable of entrapping its struggling prey. Triassic, Argentina. Argentine Museum of Natural Sciences.

78. Aphaneramma.
Skull of the large, primitive stereospondyl amphibian, a regressive and weakly-limbed, salamander-like bottom-dweller exhibiting the retention of an archaic “third eye.” Late Triassic, Arizona. University of California, Berkeley.

79. Hadrokkosaurus bradyi.
Skull of the primitive stereospondyl amphibian, resembling a giant frog and exhibiting a prominent “third eye,” a feature that vanished from the vertebrates with the extinction of these pond-dwellers. Late Triassic, Arizona. University of California, Berkeley.

80. Cyclotosaurus.
Skull of the primitive stereospondyl amphibian from the Late Triassic of Arizona. University of California, Berkeley.

188. Pachypleurosaurus edwardsi.
Skeleton of the small nothosaur, marine reptiles originally descended from terrestrial stock, ancestors of the giant plesiosaurs of the Jurasssic. Jurassic, Switzerland.

81. Aetosaurus ferratus.
Mummified skeleton of a primitive armored archosaur with a perfectly preserved hide, a passive, quadrupedal ( 4-footed) herbivore that lived by rooting and browsing. Late Triassic, Germany. Humboldt Museum.

82. Dinosaur trackway.
Grallator. Footprints of an early bipedal dinosaur closely related to Coelophysis. Late Triassic, Connecticut. Private collection.

83. Coelophysis bauri.
Superb skeleton of one of the earliest dinosaurs, exhibiting the cannibalized remains of a juvenile. A graceful and ferocious theropod (bipedal carnivore) which traveled in large herds, found in a mass burial. Late Triassic, New Mexico. American Museum of Natural History .

84. Whitea.
Skeleton of an ancient coelacanth, a crossopterygian (lobe-finned) fish closely related to tetrapod amphibians and long believed extinct until a rare, extant deep marine species was discovered in the 20th Century. Triassic, Canada. Royal Tyrrell Museum of Paleontology.

85. Thrinaxodon liorhinus.
Skulls of the advanced mammal-like reptile (featuring pronounced canine teeth ), extremely close to the ancestry of the mammals, from the Early Triassic of South America. Private collection.

89. Compsognathus longipes.
Skeleton of one of the smallest dinosaurs, a theropod exhibiting remains of its last meal (a tiny Bavarisaurus). Late Jurassic, Germany. Bavarian State Institute of Geology and Paleontology .

90. Archaeopteryx lithographica.
Spectacularly preserved skeleton of the oldest known bird, known as the “Berlin specimen.” Evolution caught in the act in the world's most famous fossil. Late Jurassic, Germany. Humboldt Museum.

91. Archaeopteryx lithographica.
A rare mounted skeleton of the “London specimen,” a feathered theropod dinosaur with teeth, and a very primitive flyer. Late Jurassic, Germany. British Museum.

92. Archaeopteryx lithographica.
Rare skeleton of a juvenile with faint feather impressions, known as the “Eichstatt specimen” and formerly identified as Compsognathus. Late Jurassic, Germany. Humboldt, Jura, and British Museums.

201. Cathayornis yandica.
Exceedingly rare skeleton of the small, feathered theropod dinosaur from the Jurassic of China. Beijing Institute of Vertebrate Paleontology.

93. Rhamphorynchus gemmingi.
Skeleton of a primitive, long-tailed flying reptile, a furry aerial fisher exhibiting well-preserved leathery wing membranes supported by its greatly elongated 4th fingers. Late Jurassic, Germany. Humboldt Museum.

94. Pterodactylus kochi.
Skeleton of the advanced short-tailed flying reptile (a mature adult individual), a highly specialized hunter of flying insects and burrowing worms. Late Jurassic, Germany. Humboldt Museum.

95. Mesolimulus walchi.
An ancient horseshoe crab, a marine arthropod related to arachnids and resembling trilobites in its fetal form, from the Late Jurassic of Germany. Private collection.

96. Othnielia rex.
Skeleton of a small, ominovorous hypsilophodont formerly known as Nanosaurus, a sprinting bipedal dinosaur ancestral to the giant duckbills of the Cretaceous, among the most successful dinosaur groups. Late Jurassic, Utah. Brigham Young University.

97. Stenopterygius quadricissus.
Skeleton of a classic ichthyosaur extraordinarily preserved with a rare epidermal impression, an advanced marine reptile which gave live birth to its young. Jurassic, Germany. Humboldt Museum.

98. Ichthyosaurus megacephalus.
Skeleton of a newborn dolphin-like marine reptile from Jurassic Germany. Private collection.

99. Coprolites. Ichthyosaur.
Fossilized excrement of a large marine reptile from the Jurassic of Mexico. Private collection.

100. Plesiosaurus hawkinsi.
Skeleton of a young plesiosaur, gigantic marine reptiles equipped with paddles and long, serpentine necks for darting and striking at fishes. From the Jurassic of Scotland. Royal Scottish Museum.

101. Apatosaurus ajax. “Brontosaurus.”
Massive leg bone of the famous thunder- lizard, a sauropod dinosaur from the Jurassic of Utah. Brigham Young University.

102. Camarasaurus lentus.
Skull of an adult sauropod, a giant herbivorous dinosaur that migrated in herds over vast distances. Late Jurassic, Utah. Carnegie Museum.

103. Camarasaurus lentus.
Skull of the most perfectly preserved juvenile sauropod ever found. Late Jurassic, Utah. Cleveland Lloyd Quarry .

189. “Ultrasaurus”.
Massive vertebra of a giant brachiosaur , the largest dinosaur ever found, from the Late Jurassic of Utah. Brigham Young University.

104. Hypselosaurus priscum.
Giant sauropod eggs from the Cretaceous of France. private collection.

106. Stegosaurus stenops.
Diminutive skull, dermal plates, and brutal tail spikes of the giant plated dinosaur, a formidably armored quadrupedal herbivore with a brain the size of a walnut. Late Jurassic, Utah. U.S. National Museum.

107. Allosaurus fragilis.
Massive skull of the giant carnosaur, ancestral to the Tyrannosaurs and an active hunter, equipped with powerful crests for violent head-butting during mating competition. Found in a mass burial containing over 40 individuals. Late Jurassic, Utah. Cleveland Lloyd Quarry .

108. Camptosaurus browni.
Hands of the small, early iguanodont, a passive, semi- bipedal herbivore. Late Jurassic, Utah. Cleveland Lloyd Quarry .

109. Camptosaurus browni.
Skull of the early iguanodont, ancestor of the giant duckbilled dinosaurs. Late Jurassic, Utah. Cleveland Lloyd Quarry .

111. Texanites texanum.
Giant ammonite, a tentacled mollusk related to the squid, extinct by the end of the Cretaceous period. Early Cretaceous, Texas. Private collection.

112. Dromaeosaurus albertensis.
Dazzling skeletons of the agile and swift-running Deinonychosaur, popularly known as “Raptors” and armed with a lethal sickle-shaped claw on each foot for slashing the bellies of their much larger prey, which they hunted in packs. Royal Tyrrell Museum of Palaeontology.

190. Deinonychus antirrhopus.
Skull of the ferocious dromaeosaur of North America, armed with the deadly sickle-claw. Yale Peabody Museum.

191. Velociraptor mongoliensis.
Skull of the vicious Chinese dromaeosaur, occasionally preserved in deathlock combat with the early ceratopsian Protoceratops. Late Cretaceous, Mongolia. Polish-Mongolian Expedition.

113. Prosaurolophus maximus.
Skull of the primitive duckbilled dinosaur, ancestor of the crested lambeosaurs, from the Late Cretaceous of Alberta. Royal Ontario Museum.

114. Parasaurolophus walkeri.
Skull of the prominently crested, advanced duckbilled dinosaur, a giant, semi-bipedal herbivore adapted for widely resonating honking displays. Late Cretaceous, Alberta. Royal Ontario Museum.

200. Edmontosaurus regalis.
Skull of the classic hadrosaur, among the largest of the duckbilled dinosaurs. Late Cretaceous, Alberta. Royal Ontario Museum.

115. Anatosaurus annectens.
Skin impression from the mummified hide of a common duckbilled dinosaur. Late Cretaceous, Montana. American Museum of Natural History .

116. Anatosaurus annectens.
Leg bone with skin impression from a partially mummified duckbilled dinosaur. Late Cretaceous, Montana. Private collection.

117. Corythosaurus casuarius.
Skull of a juvenile crested lambeosaur , an herbivorous duckbilled dinosaur from the Late Cretaceous, Alberta. Royal Ontario Museum.

118. Maiasaura peeblesorum.
Exquisite and exceedingly rare skeleton of a nestling duckbilled dinosaur, popularly known as "Maia", found in a vast nesting ground and evidence of sustained parental care after hatching. Late Cretaceous, Montana. Museum of the Rockies.

119. Coprolites.
Fossilized excrement of nestling duckbilled dinosaurs. Late Cretaceous, Saskatchewan. Private collection.

123. Struthiomimus altus.
Spectacular skeleton of the predaceous ornithomimid (or ostrich-like) dinosaur, a sleek and toothless, egg-stealing theropod capable of running 45 mph. Late Cretaceous, Alberta. Royal Ontario Museum.

124. Oviraptor philoceratops.
Nest of eggs formerly attributed to Protoceratops, now associated with the small theropod dinosaur, a carnivore from the famous Gobi Desert Expedition. Late Cretaceous, Mongolia. Alf Museum.

192. Protoceratops andrewsi.
In situ egg nest associated with the small frilled dinosaur, a social, sharply-beaked, herbivore ancestral to the giant horned dinosaurs, from the famous Gobi Desert Expedition. Late Cretaceous, Mongolia. Alf Museum.

193. Protoceratops andrewsi.
Regarded as the earliest known horned dinosaur. Found in the Gobi desert, this exquisite mounted skeleton of a rare nestling is from the Polish-Mongolian Expedition.

125. Chasmosaurus belli.
Colossal mounted skeleton of the earliest of the giant ceratopsians (horned dinosaurs ), a formidably armed herbivore equipped with a massive shield to protect its neck. Late Cretaceous, Alberta. Royal Ontario Museum.

199. Triceratops prorsus.
The last and the largest of the giant 3-horned dinosaurs, living in vast roaming herds. This excellent pair of horn cores belonged to the smallest species. Late Cretaceous, Wyoming. Private collection.

126. Stegoceras validus.
Skulls of the small, bone-headed dinosaurs adapted for head-butting competition and ancestral to the giant pachycephalosaurs. Late Cretaceous, Alberta. Royal Ontario Museum.

127. Albertosaurus sarcophagus.
Thrilling in-situ skeleton (complete) of the large ferocious carnosaur, an exceedingly rare juvenile tyrannosaur from the Late Cretaceous of Alberta. Royal Tyrrell Museum.

198. Pteranodon sternbergii.
Among the last of the pterosaurs, a female individual with a 12-foot wingspan. Mounted skeleton from Lane County, Kansas. Private collection.

128. Quetzalcoatlus northropi.
Massive upper armbone of the giant, toothless pterosaur with a 39 ft. wingspan, the largest flying creature known, from the Late Cretaceous of Texas. University of Texas.

129. Tyrannosaurus rex.
Massive skull of the giant carnosaur, a female individual and an active, bipedal hunter/scavenger, among the largest ever found. Late Cretaceous, Montana. Museum of the Rockies.

196. Tarbosaurus bataar.
Immense skeleton and egg nest of the giant carnosaur, also known as Tyrannosaurus bataar, ancestor of the North American Tyrannosaurs. Recovered by the Polish-Mongolian Expedition. Late Cretaceous, Mongolia. Queen Victoria Museum, Tasmania.

130. Tyrannosauurus rex.
Colossal foot of the giant carnosaur, one of the largest carnivores that ever lived. Late Cretaceous, Montana. Natural History Museum of Los Angeles County.

131. Tyrannosaurus rex.
One of the largest jawbones ever found of this dinosaur, which may have traveled in packs. Late Cretaceous, Montana. University of California, Berkeley.

132. Tyrannosaurus rex.
Diminutive, sense-dominated brain of the giant predator. Late Cretaceous, Montana. University of California, Berkeley.

133. Dinosaur footprint.
Positive impression of a carnosaur track, found in the ceiling of a coal mine. Late Cretaceous, Utah. Private collection.

134. Meteorite.
Evidence of a massive meteorite impact in the Yucatan is associated with the extinction of the dinosaurs 65 million years ago. This large 4.6 billion year old iron fragment, a pristine relic of the formation of the solar system, fell to Earth 25,000 years ago in Meteor Crater, Arizona. Private collection.