DGA1136648: Two specimens of Gonioteuthis, Cephalopoda (top) and Hybodus sp, Hybodontidae (below), primordial shark, Artwork by Robin Carter (photo) / Bridgeman Images

DGA1136653: Group of Ceratopsian heads (Ceratopsia), Cretaceous, Artwork by Andrew Robinson (photo) / Bridgeman Images

DGA1136656: Sthenurus sp, Macropodidae, Pleistocene, Artwork by Barry Croucher (photo) / Bridgeman Images

DGA1136659: Phenacodus sp, Phenacodontidae, Early Eocene, Artwork by Barry Croucher (photo) / Bridgeman Images

DGA1136664: Claws of dinosaurs, Artwork by Mike Dorey (photo) / Bridgeman Images

DGA1136676: Iguanodon sp, Iguanodontidae, Early Cretaceous, Artwork by Robin Carter (photo) / Bridgeman Images

DGA1136684: Morganucodonte (Morganucodon sp), Morganucodontidae and Paleocastor sp, Castoridae, Artwork by T Sitch (photo) / Bridgeman Images

DGA1136685: From top, Macropoma sp, Coccosteus sp, Acanthodes sp, Lunaspis sp, Climatius sp, Bothriolepis sp, Artwork by Steve Roberts (photo) / Bridgeman Images

DGA1136687: Archelon ischyros, Protostegidae, Cretaceous, Artwork by Jim Higgins (photo) / Bridgeman Images

DGA1136692: Procompsognathus triassicus, Coelophysidae, Triassic. Artwork by Graham Rosewarne (photo) / Bridgeman Images

DGA1136698: Ectocono (Ectoconus sp), Periptychidae, Early Paleocene. Artwork by James Robins (photo) / Bridgeman Images

DGA1136707: Elasmosaurus platyurus, Elasmosauridae, Late Cretaceous. Artwork by Stephen Roberts (photo) / Bridgeman Images

DGA1136711: Arthropleura sp, Arthropleuridae, Carboniferous. Artwork by Graham Rosewarne (photo) / Bridgeman Images

DGA1136713: From top, clockwise, Osteoborus sp, Canidae, Hesperocyon sp, Canidae, forest fox (Cerdocyon thous), Canidae, Cynodesmus sp, Canidae. Artwork by Stephen Roberts (photo) / Bridgeman Images

DGA1136718: Polacanthus sp, Polacanthidae, Cretaceous. Artwork by Steve White (photo) / Bridgeman Images

DGA1136720: Palaeolagus sp, Leporidae, Oligocene. Artwork by Mike Donnelly (photo) / Bridgeman Images

DGA1136725: Prehistoric amphibians, from left, Gerrothorax sp (Plagiosauridae), Triadobatrachus sp, Vieraella sp (Leiopelmatidae), Paleobatrachus sp (Palaeobatrachidae), Karaurus sp (Karauridae). Artwork by Steve Roberts (photo) / Bridgeman Images

DGA1136732: Animals of the Ice Age. Artwork by Mark Stewart (photo) / Bridgeman Images

DGA1136733: Brontosaurus (Apatosaurus ajax), Diplodocidae, Late Jurassic. Artwork by James Robins (photo) / Bridgeman Images

DGA1136740: Coelophysis bauri, Coelophysidae, Late Triassic. Some scientist believe that dinosaurus were covered in feathers or fur. Artwork by Mark Stewart (photo) / Bridgeman Images

DGA1136744: Seismosaurus hallorum, Diplocidae, Early Cretaceous. Artwork by James Robins (photo) / Bridgeman Images

DGA1136745: A group of Hadrosaurus foulkii, Hadrosauridae, under a rain of volcanic ash, Late Cretaceous. Artwork by Steve Roberts (photo) / Bridgeman Images

DGA1136746: Velociraptor sp, Dromaeosauridae, Cretaceous. Artwork by James Raptor (photo) / Bridgeman Images

DGA1136763: Tarbosaurus bataar, Tyrannosauridae, Late Cretaceous. Artwork by Steve White (photo) / Bridgeman Images

DGA1136979: USA; Arizona/Utah; Monument Valley; sand dunes (photo) / Bridgeman Images

DGA1136989: Smoke emitting from a volcanic landscape; Solfatara Crater; Antilles; St. Lucia (photo) / Bridgeman Images

DGA1136994: Smoke emitting from a volcano; Mt Ngauruhoe; Tongariro National Park; New Zealand (photo) / Bridgeman Images

DGA1136999: High angle view of a lake; Friuli-Venezia Giulia; Italy (photo) / Bridgeman Images

DGA1137001: Rock formations at the coast; Capo D'orso; Palau; Sardinia; Italy (photo) / Bridgeman Images

DGA1137011: Norway; Svalbard Islands; Moffen Island (photo) / Bridgeman Images

DGA1137020: Panoramic view of a valley; Honduras; Adams; Indiana; USA (photo) / Bridgeman Images

DGA1137024: Israel; Negev Desert; Timna Valley National Park; Eroded sandstone formations (photo) / Bridgeman Images

DGA1137025: Israel; Negev Desert; Timna Valley National Park; Eroded sandstone formations (photo) / Bridgeman Images

DGA1137027: Israel; Negev Desert; Timna Valley National Park; Eroded sandstone formations (photo) / Bridgeman Images

DGA1137029: Ecuador; Galapagos Islands; Santiago Island; Lava formations (photo) / Bridgeman Images

DGA1137032: Turkey; Cappadocia; Zelve; Ask Valley; Fairy chimneys; Peri Bacalari (photo) / Bridgeman Images