1. The shortest mammal in the world is the bumblebee bat, which is about the size of a thumbnail and weighs less than a penny.
  2. The tallest mammal in the world is the giraffe, which can grow up to 18 feet tall.
  3. The elephant is the largest land animal on earth and can live up to 70 years.
  4. The blue whale is the largest animal on earth and can grow up to 100 feet long and weigh over 200 tons.
  5. The cheetah is the fastest land animal and can run up to speeds of 70 mph.
  6. The pufferfish can inflate its body to protect itself from predators by filling its stomach with air or water.
  7. The octopus has three hearts and can regenerate its arms if they are damaged.
  8. The flamingo can stand on one leg for hours at a time thanks to a special joint in its ankle.
  9. The toucan has the largest beak relative to its body size of any bird.
  10. The hummingbird is the only bird that can fly backwards.
  11. The giant anteater has a tongue that is longer than its body and can use it to consume up to 30,000 ants in a single day.
  12. The polar bear is the largest carnivorous land animal and can swim up to 60 miles at a time.
  13. The kangaroo can jump up to 30 feet in a single bound and travel at speeds of up to 35 mph.
  14. The chameleon can change the color of its skin to match its surroundings for camouflage.
  15. The poison dart frog has bright colors to warn predators that it is toxic.
  16. The giant panda is a carnivorous bear that primarily eats bamboo.
  17. The bat is the only mammal that can fly and is also the only mammal that can rotate its hind legs 180 degrees to hang upside down.
  18. The anteater has a long, sticky tongue that it uses to catch insects and has no teeth.
  19. The narwhal is a type of whale with a long, spiral tusk that is actually a tooth.
  20. The sloth is the slowest moving mammal and can take up to a month to digest a single leaf.