| DiplodocusLength, estimate from fossils | 26 m85.3 ft | Natural History Museum, London |
| BrachiosaurusHeight, estimate from fossils | 12 m39.4 ft | US Geological Survey |
| MegalodonLength, estimate from fossils | 15 m49.2 ft | Natural History Museum, London |
| SpinosaurusLength, estimate from fossils | 14 m45.9 ft | Natural History Museum, London |
| Tyrannosaurus rexLength, estimate from fossils | 12.3 m40.4 ft | Natural History Museum, London |
| QuetzalcoatlusWingspan, estimate from fossils | 10.5 m34.4 ft | University of Texas at Austin |
| StegosaurusLength, estimate from fossils | 9 m29.5 ft | Natural History Museum, London |
| TriceratopsLength, estimate from fossils | 8.5 m27.9 ft | Natural History Museum, London |
| PteranodonWingspan, estimate from fossils | 6 m19.7 ft | American Museum of Natural History |
| Woolly mammothShoulder height, estimate from fossils | 3.1 m10.2 ft | Natural History Museum, London |
| VelociraptorLength, estimate from fossils | 1.8 m5.9 ft | Natural History Museum, London |