1. Whale shark
   Great white shark
2. Tiger shark
   Mako shark

The great white shark is certainly a formidable predator, largely due to its immense size: Some can grow up to 20 feet long! The only predator they seem to fear is the orca, also known as the killer whale.

1. Whale shark
   Goblin shark
2. Great white shark
   Hammerhead shark

Despite their tremendous size, whale sharks are harmless to humans. As filter feeders, they eat plankton and tiny fish with their large gaping mouths. Some scientists believe they can live to be 130!

1. Bull shark
   Tiger shark
2. Frilled shark
   Greenland shark

Because the bull shark can swim in both seawater and freshwater, it's been discovered as far as 700 miles up the Mississippi River. Bull sharks get their name for their bullish shape and temperament.

1. Tiger shark
   Hammerhead shark
2. Basking shark
   Thresher shark

The fierce tiger shark comes in second place (after the great white) for fatal shark attacks on people. Its stripes fade over time, and the tiger shark can reach a length of 16 feet.

1. Megamouth shark
   Lemon shark
2. Nurse shark
   Mako shark

Lemon sharks tend to live in communities and travel back to the same location to reproduce. These nocturnal hunters use electroreceptors to find fish and pose no substantial risk to humans.

1. Cookiecutter shark
   Blacktip shark
2. Shortfin mako shark
   Megamouth shark

So few megamouth sharks have been captured that scientists don't know too much about it, except that it's a filter feeder like the whale shark and basking shark. It has a bulbous head and a wide mouth.

1. Mako shark
   Blue shark
2. Cookiecutter shark
   Leopard shark

Although reaching only 22 inches in length, the cookiecutter shark is not afraid to take a bite or two out of much larger animals. It gets its name from the way it extracts "plugs" of flesh from prey.

1. Salmon shark
   Sandbar shark
2. Porbeable shark
   Hammerhead shark

Hammerhead sharks are unique in that they swim together in schools in the daytime and hunt alone at night. Scientists believe the shark's hammer-like head gives it 360-degree vision.

1. Bonnethead shark
   Angel shark
2. Sawshark
   Dusky shark

We suppose the bonnethead's head may resemble a bonnet, although it could also be described as a shovel or a taco! This shark only grows to about three feet in length and eats plants as well as fish.

1. Galapagos shark
   Zebra shark
2. Sand shark
   Angel shark

While young zebra sharks have a stripe pattern, those stripes morph into spots as the shark ages. Zebra sharks spend their days lying still on the ocean floor but come out to hunt at night.

1. Leopard shark
   Blue shark
2. Bluntnose sixgill shark
   Sand tiger shark

Named for the distinctive spots and "saddles" on its back, the leopard shark swims in schools, usually at night. Although they're commonly spotted near the coasts, they don't threaten humans.

1. Blacktip shark
   Nurse shark
2. Greenland shark
   Thresher shark

The solitary thresher shark lives in temperate and tropical oceans. It's named for its long tail, which is often as long as the shark's body. Threshers use this tail to stun prey.

1. Greenland shark
   Frilled shark
2. Sandbar shark
   Epaulette shark

Researchers used radiocarbon dating to determine that Greenland sharks are the longest-living vertebrates in the world. They can grow up to 24 feet long, and they live in the North Atlantic and Arctic Oceans.

1. Whitespotted bamboo shark
   Epaulette shark
2. Dwarf lantern shark
   Horn shark

The epaulette shark has distinctive spots behind its fins, calling to mind the epaulettes on military uniforms. These sharks primarily live in the warm waters around Australia and New Guinea.

1. Galapagos shark
   Spinner shark
2. Angel shark
   Port Jackson shark

The scientists who named this shark found it in the Galapagos Islands, hence the name. The shark can reach about 10 feet in length and likes to snack on bony fish, octopuses and squids.

1. Hammerhead shark
   Frilled shark
2. Basking shark
   Goblin shark

Along with the whale shark and megamouth, the basking shark eats primarily plankton as a filter feeder. And while it can grow up to 26 feet long, it's a slow swimmer and not an aggressive species.

1. Frilled shark
   Mako shark
2. Blacktip shark
   Oceanic whitetip shark

It's a good thing this shark typically stays thousands of feet underwater, because it looks simply terrifying! The frilled shark has a long, eel-like body and a stretchy mouth that lets it eat prey whole.

1. Lemon shark
   Sand tiger shark
2. Blue shark
   Nurse shark

Don't underestimate the nurse shark! Even though it tends to be slow and inactive, it ranks fourth in shark attacks on people. Nurse sharks are brown in color and grow up to 10 feet long.

1. Leopard shark
   Bluntnose sixgill shark
2. Mako shark
   Sandbar shark

As the name suggests, the bluntnose sixgill shark has a blunt snout and six gills — and can grow up to 26 feet long! This shark also has fluorescent blue-green eyes, the better to terrify its prey!

1. Mako shark
   Salmon shark
2. Great hammerhead shark
   Sawshark

There are two types of mako sharks alive today: shortfin and longfin. A type of mackerel shark, the mako is blue and grey in color. The shortfin mako is the fastest shark, reaching speeds of 42 mph.

1. Angel shark
   Porbeagle shark
2. Caribbean reef shark
   Dwarf lantern shark

With is flat body and wide pectoral fins, the angel shark looks like a ray. The shark lies motionless in the sand until the prey is overhead; then it lunges upward and captures its meal.

1. Spinner shark
   Horn shark
2. Epaulette shark
   Dusky shark

Dusky sharks have no natural predators — except for humans. Because dusky sharks have slow reproductive cycles, they're vulnerable to being overfished. They will also eat anything, including garbage.

1. Dwarf lantern shark
   Horn shark
2. Whitespotted bamboo shark
   Common thresher shark

Whitespotted bamboo sharks grow to only 24 to 37 inches, so some people keep them as pets. They have an easily recognizable appearance, with a round snout, narrow body, brown stripes and white spots.

1. Port Jackson shark
   Dwarf lantern shark
2. Hammerhead shark
   Broadnose sevengill shark

Growing only about seven inches, the dwarf lantern shark is the smallest known shark in the world. Most are found in the Caribbean near Colombia and Venezuela. Females have two or three pups at a time.

1. Caribbean reef shark
   Grey reef shark
2. Sawfish
   Blacktip shark

Even though this shark stays pretty deep, it's well known for its long snout edged with teeth, giving it a saw-like appearance. The shark uses this saw to disable its prey (and sometimes predators).

1. Sand tiger shark
   Pacific sleeper shark
2. Grey reef shark
   Blacktip shark

Blacktip sharks get their name from the black coloring on the tips of their fins. They can leap out of the water to catch fish, and females return to the place of their birth to reproduce themselves.

1. Pacific sleeper shark
   Bonnethead shark
2. Longfin mako shark
   Horn shark

The Pacific sleeper shark is a stealthy predator because of the way it effortlessly glides through deep waters. It uses suction to draw food into its mouth and chops it up with spiky teeth.

1. Catshark
   Horn shark
2. Port Jackson shark
   Galapagos shark

The horn shark has a distinctive appearance with ridges over the eyes and spots over its brown or grey body. It is typically active at night and will leave humans alone if the favor is returned!

1. Port Jackson shark
   Catshark
2. Longfin mako shark
   Whitespotted bamboo shark

The Port Jackson shark lives in the waters around Australia and migrates south for summers and north for winters. Its distinctive markings make it look like it's wearing a harness.

1. Zebra shark
   Caribbean reef shark
2. Dusky shark
   Catshark

Catsharks live in tropical and temperate waters around the world and may have earned their name from their cat-like eyes. Most catsharks are small and have patterns of spots or stripes.

1. Salmon shark
   Sandbar shark
2. Wobbegong shark
   Bluntnose sixgill shark

Although the sandbar shark somewhat resembles bull sharks, it's typically harmless to humans. It prefers to eat rays, fish and crabs and must watch out for predators like tiger sharks and great whites.

1. Thresher shark
   Sand tiger shark
2. Wobbegong shark
   Goblin shark

Wobbegongs live around Australia and Indonesia; their name comes from the Aboriginal word for "shaggy beard" due to the "whiskers" around the mouth. Wobbegongs rest on the seafloor and ambush fish.

1. Goblin shark
   Nurse shark
2. Spiny dogfish shark
   Basking shark

The goblin shark looks like it auditioned for a role in "Alien." The pinkish shark has a long, pointy snout and jaws that extend to gobble prey. Lucky for us, goblin sharks are rare.

1. Carpet shark
   Angel shark
2. Bramble shark
   Cow shark

The bramble shark has a cylindrical form that tapers at the head. People rarely bump into this shark because it usually stays at great depths (up to 3,000 feet), feeding on fish and other sharks.

1. Blue shark
   Whale shark
2. Frilled shark
   Shortfin mako shark

So named because of their blue color on top, blue sharks have large round eyes and a slender build. Blue sharks eat smaller sharks, but they too find themselves hunted by tiger sharks.

1. Spiny dogfish shark
   Wobbegong shark
2. Brown-banded bamboo shark
   Oceanic whitetip shark

Young brown-banded bamboo sharks have thick brown bands, the adults tend to lose this pattern. This hardy shark makes it home in tidal pools and coral reefs, typically between Japan and Australia.

1. Bull shark
   Thresher shark
2. Catshark
   Spiny dogfish shark

The spiny dogfish has two spines near its dorsal fins that it uses defensively against predators. This aggressive shark prefers to hunt in large packs, sometimes numbering in the thousands.

1. Nurse shark
   Oceanic whitetip shark
2. Spiny dogfish shark
   Sand tiger shark

Residing in temperate and tropical waters, the oceanic whitetip shark takes part in feeding frenzies. If your ship or plane crashed in the sea, you'd be most worried about this shark.

1. Sand tiger shark
   Angel shark
2. Nurse shark
   Catshark

The sand tiger shark is unrelated to the more vicious tiger shark. It lives in sandy shorelines around the world and has the unique ability to gulp water, which helps it float effortlessly.

1. Catshark
   Dwarf lantern shark
2. Spinner shark
   Dusky shark

The spinner shark attacks schools of fish by swimming up vertically and spinning on its axis, leaping out of the water at the end. Because they swallow small fish whole, they usually leave humans alone.