1. In celebration of our new film Great White Shark, now playing daily in 3D and IMAX, here are some spectacular shark facts:

    • Sharks began evolving about 450 million years ago. Of the roughly 340 living species some have changed little in the past 100 million years.
    • Sharks were the first vertebrates to develop an immune system and may have a greater immunity to cancer than humans.
    • Shark teeth are made of hard enamel, which may explain why ancient shark teeth are the most commonly found vertebrate fossils today.
    • Some living shark species replace old and broken teeth as frequently as every ten days. There are 12,000 bull-shark fossil teeth on view in the Museum’s Hall of Vertebrate Origins—approximately the number of teeth a bull-shark will have during its lifetime. 
    • Shark bones are made of light, tough cartilage, which is rarely fossilized.
    • Like other cartilaginous fishes, sharks do not have a gas bladder to keep them afloat so many species (but not all) must move constantly to keep from sinking. Many sharks have large, oil-filled livers that make them more buoyant.
    • Most sharks bear live young. Some species can remain pregnant for over two yea­rs, longer than any other vertebrate.
    • Sharks typically bear three to 12 pups and many do not reproduce until age 30, making it hard for them to recover when large numbers are killed by humans.

Notes

  1. purgamentum-exit reblogged this from sagansense
  2. f8cr reblogged this from sagansense
  3. fandomsfinest reblogged this from amnhnyc
  4. franksandstein reblogged this from bumbleshark
  5. official-sherlock-holmes reblogged this from trashholmes
  6. trainerbroshiki reblogged this from drummerbunny
  7. drummerbunny reblogged this from bandicoot-curtlesnoot
  8. bandicoot-curtlesnoot reblogged this from just-anotherdirtbag
  9. just-anotherdirtbag reblogged this from marilynde
  10. blue-samael reblogged this from word-vommit96
  11. word-vommit96 reblogged this from 21-o
  12. fjardyozzfjard reblogged this from tyrannosaurslair
  13. mermaids-mask reblogged this from fritti-tailchaser
  14. fritti-tailchaser reblogged this from tyrannosaurslair
  15. forever-next-to-never reblogged this from amnhnyc
  16. 21-o reblogged this from amnhnyc and added:
    If I were given a decently safe trip into the ocean to swim next to this gorgeous beast, I would definitely not pass it...
  17. iamtheisraelimoose reblogged this from amnhnyc
  18. sans-nuage reblogged this from sagansense
  19. yourface-iscute reblogged this from sharkandbite
  20. a-personal-problem reblogged this from amnhnyc
  21. notadeinonychus reblogged this from tyrannosaurslair
  22. tminor4 reblogged this from verybluebirdy
  23. oldoddandowly reblogged this from tyrannosaurslair
  24. wonder-in-the-wild reblogged this from verybluebirdy and added:
    Great White Sharks.
  25. verybluebirdy reblogged this from tyrannosaurslair
  26. tyrannosaurslair reblogged this from amnhnyc