The biggest dinosaur ever found is spinosaurus, which is 50 feet or 15 meters long.
Megalodon, an ancient shark that lived about 2.6 million years ago, was the largest shark ever and could reach a length of about 60 feet or 18 meters.
Archaeopteryx, an ancient bird that lived about 150 million years ago, was considered a missing link between dinosaurs and birds.
Pterodactyl or Pteranodon, an ancient flying reptile, is not dinosaurs but a separate group member called pterosauria.
Stegosaurus, herbivorous dinosaurs, has a back that is equipped with a large bone called plaka to protect itself from predators.
Triceratops, herbivorous dinosaurs, have three large horns on the head and large plates on their backs to protect themselves from predators.
Sabertooth tiger or smilodon, ancient carnivorous mammals, has very large and sharp canines that can reach a length of 7 inches or 18 cm.
Woolly Mammoth, an ancient herbivorous mammal that lives in cold climates such as Siberia, has thick and large fur that helps her survive in a cold environment.
Glyptodon, an ancient mammal that lives in South America, has a hard shell like a turtle to protect itself from predators.
Dimetrodon, an ancient reptiles that lived around 295 million years ago, has a signed back which is an increase in the structure of the skin to regulate its body temperature.
