1. When leopard sharks age, their spots lose color.
2. Bonnethead sharks are the only known omnivore sharks. They are able to consume and digest sea grass.
3. Whale shark's spot patterns are unique to each one, similar to fingerprints in humans.
4. Zebra sharks can reproduce asexually.
5. Angel sharks are the only living members of the Squatinidae family.
6. Nurse sharks capture their prey using suction.
7. Basking sharks migrate in the summer in groups of the same sex.
8. Caribbean reef sharks can spit their stomachs inside out and through their mouths to get rid of parasites and undigestible food.
9. Sharks have been around longer than trees.
10. Newborn nurse sharks have a spotted pattern rather than solid brown like adults.
11. Greenland sharks have the longest lifespan of any vertebrate, living up to 400 years, and sometimes more!
12. Lemon sharks can form relationships with divers and will push other sharks away from their favorite diver when trying to get pets.
13. Zebra sharks are born dark brown with white stripes, which turns tan with dark brown spots as they age.
14. The shortfin mako has one of the largest brains compared to body size.
15. Sharks have no ribcage so if they wash up on shore, their organs can be crushed by their body weight.
16. Stingrays are a close relative to sharks.
17. The dwarf lantern shark is the smallest shark, only growing up to 8 inches.
18. Sharks cannot swim backwards.
19. Most sharks have 8 fins, but some have fewer.
20. The tail fin is known as the caudal fin.
21. Most sharks have 5 gill slits but some have 6 and sometimes 7.
22. Ground sharks can grow as many as 35,000 teeth over their lifetime.
23. Great whites have the longest teeth, at 2.5 inches long.
24. Sharks have "dermal denticles" which means "small skin teeth".
25. Shark skin is so rough it can injure an attacker.
26. Portuguese dogfish have the deepest dive, at 12,057 ft deep.
27. Whale sharks have the thickest skin of any animal, being 4 in thick.
28. Most sharks can breathe without swimming, but sharks like great whites and hammerheads cannot.
29. Decomposing basking shark carcasses lose most of their lower head, dorsal, and caudal fins first, making them resemble a plesiosaur.
30. Bonnethead sharks are the smallest members of the hammerhead family.
31. Female bamboo sharks have thicker skin than male bamboo sharks.
32. Caribbean reef sharks have been found "sleeping" in caves on the ocean floor for an unknown reason.
33. Lemon sharks have been known to make sounds such as grunts, clicks, and whistles.
34. Epaulette sharks have evolved to cope with sever night time oxygen depletion called hypoxia.
35. Ampullae of Lorenzini are jelly filled canals that detect electrical signals.
36. Thresher sharks circle their prey, making the circle smaller and smaller until they catch it.
37. Hammerhead sharks like to feed in groups.
38. Epaulette sharks can selectively shut down non-essential neural functions.
39. Some sharks, like the pyjama shark, will curl up into balls, similarly to cats, when they feel threatened or uneasy.
40. Sharks do something called "skyhopping", which is when they peak their heads out of the water to see what's happening above the surface.
41. Salmon sharks are partially warm blooded.
42. Hammerheads cephalofoils (their heads) give them 360 degree vision.
43. Bull sharks can live in freshwater and salt water.
44. Tiger sharks are known as the oceans garbage cans because they will eat pretty much anything they find.
45. Mako sharks are capable of speed bursts up to 46 mph.
46. Hammerhead sharks are immune to stingray venom.
47. Deep Blue, a 20 ft, 50 year old, female great white, is one of the largest great white sharks ever recorded.
48. Some sharks lay eggs in spiral casings and wedge them between rocks to keep them safe from predators and being washed away.
49. Epaulette sharks get their names from the large black spot on their sides, which resembles military shoulder pads.
50. Scalloped hammerheads have been found sun tanning, just like humans.
51. Bull sharks have one of the strongest bite forces of any shark.
52. Whale sharks can retract their eyeballs back into their sockets.
53. Goblin sharks can extend their jaw 2-9 times further than other sharks, shooting out faster than any other fish.
54. There are 9 recognized species of hammerhead sharks.
55. Whale sharks mouths are huge, but their throats are about the size of a penny.
56. Frilled sharks, often called "living fossils", can be traced back to the Cretaceous period 95+ million years ago.
57. Sand tiger sharks gulp air from the surface to help them float motionless while watching prey.
58. Angel shark's eyes are located on top of their heads so they can stay hidden while planning attacks.
59. Cookie cutter sharks get their name from how the leave cookie cutter like wounds in prey.
60. Salmon sharks are closely related to the great white shark.
61. Saw shark pups are born with their teeth folded against their snouts to avoid injuring their mother during the birth.
62. Wobbegongs are believed to have gotten their names from the Aboriginal word "wobbegong", meaning "shaggy beard".
63. Puffadder shysharks can glow in the dark using something called "biofluorescence", which is only visible to the human eye using a special kind of light.
64. Blue sharks are one of the only non-filter feeding sharks that have been observed eating krill.
65. Dusty shark teeth have been found in fossils dating back to the Miocene era 23 million - 5.3 million years ago.
66. Sharks can solve puzzles by observing other sharks solving them.
67. Some sharks are very aggressive while mating, leaving bite marks and scars on each other.
68. Greenland sharks have a parasite that feeds on only their eyes, making them blind.
69. Epaulette sharks can "walk" on the ocean floor with their pectoral fins.
70. Shark pups can sense danger from within their eggs.
71. Many shark pups hunt each other inside their mothers before even being born.
72. Scientists have found hammerheads and silky sharks living in hot, murky, and acidic water, inside of an active volcano called Kavachi.
73. Nurse sharks get their name from the suckling sound they make while eating.
74. Whale sharks have to travel over 5,000 miles a year just to get enough food.
75. Sharks can sense Earth's magnetic field and use it for navigation.
76. Great white sharks can be found in pretty much every ocean.
77. Lemon sharks get their name from the lemon-like color of their skin.
78. Some sharks lay eggs called "mermaid purses".
79. Whale sharks have dermal denticles on their eyes since they don't have eyelids.
80. Shark teeth are not made of bone, but an enameloid covered, dentin core.
81. The greenland shark is the slowest shark, and only beats its tail 9 times per minute.
82. About 18% of great whites brains are dedicated to smell.
83. Copper sharks swim around fishermen in hopes of stealing their catches.
84. Swell sharks are named for their ability to gulp water when scared, in order to become too big for any predator to eat.
85. Megalodon went extinct due to cooling waters and a drop in small whales— their main food source.
86. Female bonnetheads give birth to live pups 5 months after mating, the shortest known shark pregnancy.
87. When threatened, caribbean reef sharks will flap their pectoral fins, arch their backs, and dart around in different directions to confuse and scare off predators.
88. Lemon sharks large brains are as big in comparison to its body size as a birds brain, making them very clever.
89. During mating, female and male blacktip reef sharks "court" each other by swimming behind each other in curved paths.
90. A whale shark can take in around 1,585 gallons of water every hour.
91. When brown-banded bamboo sharks bite hard-shelled prey, its teeth fold backward to help crush it.
92. The tasselled wobbegong shark kills other sharks almost as large as itself, such as bamboo sharks.
93. Shortfin mako sharks have the strongest recorded bite of any shark, at a weight of 3,000 pounds.
94. Unlike most sharks, epaulette sharks sometimes chew food for up to 10 miutes to crush shells and bones,
95. The average salmon shark eats around 11 pounds of food every day, about the weight of a 2 month old baby.
96. Sand tiger sharks are overfished and critically endangered because they only have 2 pups at a time.
97. In Hawaiian mythology, Kamohoali'i, a shark god, was believed to bring ships home by shaking its tail and leading the way.
98. The megamouth shark was discovered in 1976 and since then only about 100 of them have been spotted.
99. Goblin sharks were discovered near Japan in 1898, and named "tenguzame", after the tengu, a mythical Japanese creature with a long nose.
100. When smalltooth sand tiger sharks are scared, they stop, open their mouth, and shake their tail towards the threat.