ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

ABC, ABC News, ESPN and National Geographic present a 24-hour multi-platform broadcast celebrating America's 250th anniversary.

Ryan Seacrest hosts the celebration featuring fireworks and musical performances, including The All-American Rejects, Boyz II Men, Brothers Osborne, Clint Black, Elizabeth Nichols, Emily Ann Roberts, John Crist, Lauren Daigle, Little Big Town, NE-YO, Nick Jonas, Reba McEntire, Sublime and Tim McGraw.

From glacial peaks to coastal rainforests, Olympic has rich biodiversity.

Soaring cliffs, canyons and water shape a diverse wildlife refuge in Zion.

From volcanic origins, Katmai's lush expanse boasts more than just bears.

An ecological treasure of North America, the Everglades brims with life.

An American trailblazer, Yellowstone is renowned for its natural wonders.

A look at Lake Clark, a hidden gem where animals and people coexist in harmony.

A look at Channel Islands' unique landscapes and wildlife, revealing an older version of California.

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Scientists reveal the unseen lives of white sharks hunting other sharks.

Whether on the hook or in utero, sharks eat their own and scientists from Australia to Florida use the latest tagging and tracking measures to understand why.

After inventing armored suits for divers 40 years ago, Jeremiah Sullivan jumps back in the water to test out just how foolproof his latest creation really is against hungry hammerheads and deadly tiger sharks.

A team of experts travels to Shark Bay, Australia, to unlock the secrets of shark and dolphin combat; cutting-edge technology provides a window into this seldom-seen conflict.

In the Bahamas, over 30% of dolphins have shark bite scars; using a non-toxic gel bite pad and a life-sized dolphin lure, a look at bite impressions of three species that could be predators.

A rare event between top ocean predators was captured on video in Florida: bull sharks attacking a great hammerhead. Dr. Heithaus and a team of shark experts launch an investigation pinning one against the other.

Rare instances of predation on sharks by seals, crocodiles, octopi, bobcats and birds.

Researchers investigate if orcas are hunting great whites in New Zealand.

Up close with some of the largest great white and tiger sharks ever filmed.

Anthony Mackie uncovers a shark mystery with fishermen in Louisiana.

Chris Hemsworth investigates living harmoniously with sharks.

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

Bertie travels to Mexico in search of the endangered hammerhead shark.

Shark experts discover what's behind the surge in massive sharks.

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

Bertie travels to Mexico in search of the endangered hammerhead shark.

Shark experts discover what's behind the surge in massive sharks.

The team investigates the link between sounds and shark attacks.

The team investigates the links between weather events and shark attacks.

The team investigates a theory that color can trigger sharks to attack.

The team explores the links between climate patterns and shark attacks.

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Great hammerhead sharks are expanding their range and coming closer to shore; Dr Neil Hammerschlag is diving in to find out why.

Steve Backshall encounters a diverse world of sharks in the Atlantic.

Steve Backshall explores the Indian Ocean and its diverse wildlife.

Steve joins scientists to find shark hot spots in the Pacific Ocean.

Steve Backshall looks for the 30-plus sharks of the British Isles.

Warm, cold, rich and murky water collide along South Africa's rocky coast to create "shark central," with great whites, tiger sharks, bull sharks, ragged tooth sharks and whale sharks all reigning supreme in the waters.

Whether it's the biggest great white, the most photographed tiger shark or the shark known for jumping 100 feet up out of the water; diving into the stories of notable shark stars.

Counting down the top 10 most terrifying sharks from around the globe.

Marine biologist Kori Garza and underwater cinematographer Andy Casagrande journey to French Polynesia to track Kamakai, one of the largest tiger sharks on record.

Investigating if oceanic white tips are the most dangerous sharks.

Off the coast of Oahu, divers and photographers experience one of the most incredible great white shark encounters ever caught on camera, featuring the two largest great whites ever filmed in Hawaii, including the shark known as Deep Blue.

A team is on an expedition to find the world's biggest hammerhead.

A team searches for giant mako sharks in remote New Zealand waters.

Is a 3000-year-old Japanese cold case the oldest shark attack ever investigated?

Off the coast of Oahu, divers and photographers experience one of the most incredible great white shark encounters ever caught on camera, featuring the two largest great whites ever filmed in Hawaii, including the shark known as Deep Blue.

A team searches for giant mako sharks in remote New Zealand waters.

Is a 3000-year-old Japanese cold case the oldest shark attack ever investigated?

One great white gets too close for comfort to a shark researcher in Cape Cod.

Shark attacks caught on video reveal clues to help better understand sharks like never before.

A cage diver is horrified when a great white shark becomes stuck in the cage.

Marine biologist Dr. Ryan Daly and a team of scientists utilize cutting-edge technology to reveal the movements and behavior of bull sharks.

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How the giant megalodon shark took over the oceans.

Intense close calls allow us to uncover why sharks are such amazing predators.

Uncover how to minimize risks in the dangerous shark hot spots.

A vacation hot spot is rocked by a series of shark attacks, chaos reigns.

Shark attacks in the Red Sea as part of a trend worldwide.

The remarkable stories of people saved from shark attacks by other species.

Accounts of shark attacks on surfers; caught-on-camera encounters, and interviews with the victims; insight from marine biologists Ryan Johnson and Dr. Stephen Kajiura.

Sharks go head-to-head with surfers, scientists, sea lions and even whales.

A team of experts travels to Shark Bay, Australia, to unlock the secrets of shark and dolphin combat; cutting-edge technology provides a window into this seldom-seen conflict.

In the Bahamas, over 30% of dolphins have shark bite scars; using a non-toxic gel bite pad and a life-sized dolphin lure, a look at bite impressions of three species that could be predators.

Rare instances of predation on sharks by seals, crocodiles, octopi, bobcats and birds.

Researchers investigate if orcas are hunting great whites in New Zealand.

Shark experts Nico Lubitz and Adam Barnett head into the wilds of northeastern Australia to investigate reports of bull sharks and saltwater crocodiles clashing along the Daintree River.

At remote Norfolk Island in the South Pacific, shark experts Lauren Meyer, Adam Barnett and Charlie Huveneers investigate why tiger, dusky and Galápagos sharks gather here in such high numbers.

In an enhanced episode, Hawaii is shaken by three shark attacks in less than five months.

Shark experts Nico Lubitz and Adam Barnett head into the wilds of northeastern Australia to investigate reports of bull sharks and saltwater crocodiles clashing along the Daintree River.

At remote Norfolk Island in the South Pacific, shark experts Lauren Meyer, Adam Barnett and Charlie Huveneers investigate why tiger, dusky and Galápagos sharks gather here in such high numbers.

In Mexico's Pacific waters, Bertie Gregory goes in search of a predator, the hammerhead shark; once abundant here, hammerhead numbers have declined enough that encounters are now rare.

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

A team of experts looks at bull sharks and explores why the territory of the notoriously aggressive species is spreading and leading to an increase in attacks.

Sightings of great white sharks have been rising in Atlantic Canada; Alanna Canaran is on a mission to unravel the enigmas surrounding these creatures, determined to dispel fear of sharks among Nova Scotians.

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Regain independence and enjoy greater mobility with the compact design and long-lasting battery of portable oxygen.

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

In Mexico's Pacific waters, Bertie Gregory goes in search of a predator, the hammerhead shark; once abundant here, hammerhead numbers have declined enough that encounters are now rare.

Shark experts investigate the jaws of the world's three deadliest sharks.

Rare footage explores the most astounding shark attacks.

Multiple instances of sharks attacking humans in pairs.

Brazen shark attacks targeting people.

Orcas leave scientists baffled when they attack white sharks for their livers.

A drone films a humpback whale being strategically drowned by a great white shark; marine biologist Ryan Johnson explores how and why great white sharks become whale killers.

Oceanic titans clash in the remote crystal-blue battlefields of Ascension Island, where the yellowfin tuna are often faster, fitter and bigger than the sharks, reaching well over 250 pounds.

After inventing armored suits for divers 40 years ago, Jeremiah Sullivan jumps back in the water to test out just how foolproof his latest creation really is against hungry hammerheads and deadly tiger sharks.

A rare event between top ocean predators was captured on video in Florida: bull sharks attacking a great hammerhead. Dr. Heithaus and a team of shark experts launch an investigation pinning one against the other.

Up close with some of the largest great white and tiger sharks ever filmed.

Scientists investigate why huge numbers of sharks gather in a dangerous lagoon on Australia's Great Barrier Reef, revealing a complex battleground.

Shark experts investigate unusually high great white activity around a seal and sea lion colony off Australia's Greenly Island.

In an enhanced episode, LA is shocked by four shark attacks in four months.

Scientists investigate why huge numbers of sharks gather in a dangerous lagoon on Australia's Great Barrier Reef, revealing a complex battleground.

Shark experts investigate unusually high great white activity around a seal and sea lion colony off Australia's Greenly Island.

Chris Hemsworth investigates living harmoniously with sharks.

Anthony Mackie uncovers a shark mystery with fishermen in Louisiana.

Professional shark diver Eli Martinez and scientist Matthew Smukall plunge into the nighttime world of Tiger Beach to investigate whether shark behavior changes once the sun goes down.

Great hammerhead sharks are expanding their range and coming closer to shore; Dr Neil Hammerschlag is diving in to find out why.

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Sharks, ancient and skilled hunters, reign supreme in the world's oceans.

A look at sharks living deep in the ocean, where extreme adaptation is critical to survival.

Tag along with scientists from around the world as they examine unprecedented adaptions for shark superiority.

A fearless team dives in to solve the secret gathering of Maui sharks.

A journey reveals hammerheads' connection to lunar cycles.

Asking if female sharks are the ultimate rulers of the oceans.

Discovering the secret life of baby great whites, right off New York City.

Even the biggest and fiercest predators start out as baby sharks.

A team of scientists embarks on an adventurous journey with the help of the latest drone technology, and unveils the startling proximity of sharks to the shore, and reveals amazing shark action.

To find out why sharks are drawn to Hawaii's volcanoes, Dr. Mike Heithaus and Dr. Frances Farabaugh free dive with one of the most dangerous sharks.

A record number of great white sharks are hunting off Cape Cod.

White Sharks move north to Canadian waters where scientists investigate.

The 360 team investigates a string of shark attacks in Australia.

Diva and the 360 team investigate a series of bites by bull sharks.

The team uncovers dramatic shark bite changes along South Africa's coast.

The 360 team investigates shark attacks on foil boarders.

Enhanced; two unlucky swimmers are attacked by sharks twice.

The 360 team investigates a string of shark attacks in Australia.

Diva and the 360 team investigate a series of bites by bull sharks.

The team uncovers dramatic shark bite changes along South Africa's coast.

The 360 team investigates shark attacks on foil boarders.

In 2016, sharks descend on Maui, Hawaii, turning paradise into chaos.

Experts race to solve a mysterious rise in sharks attacks in Florida.

Experts investigate an alarming spike in shark attacks in northern California.

Three shark attacks leave Galveston, Texas, shocked and desperate for answers.

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For years sharks have been viewed as solitary predators, but scientists have recently discovered a surprising new behavior -- that this apex predator likes to hang out in gangs.

Using a new experimental diving cage, two shark biologists investigate rising reports of bull sharks stealing from fishermen in northern Australia.

Marine biologist Dr. Austin Gallagher searches for the holy grail of shark research -- the secret breeding grounds of tiger sharks.

Investigating why people are having increasingly more encounters with sharks along the coastal waters of the United States.

The world's leading authorities on sharks investigate the mounting evidence that shark-on-shark attacks are in fact a common occurrence.

The surprising ways sharks hunt and the solutions they have found to catching prey.

From high-speed attacks to pack hunts, sharks have evolved to hunt in extraordinary ways; scientists and filmmakers capture five of the world's great feeding events for sharks.

Sharks sometimes eat the strangest things.

Shark biologist Marcus Drymon unravels the mystery of the songbird-eating shark.

Scientists investigate the giant tiger sharks of Norfolk Island.

Whether on the hook or in utero, sharks eat their own and scientists from Australia to Florida use the latest tagging and tracking measures to understand why.

Scientists reveal the unseen lives of white sharks hunting other sharks.

The 360 team investigates a mysterious shark attack on a 10-year-old boy.

The 360 team investigates a devastating shark bite in Australia.

A spate of shark bites hits Long Island after 40 years, and experts explore why.

A day of surfing abruptly ends when a shark bites Elinor's surfboard.

In this enhanced episode, an Alabama beach town is a shark attack hot spot.

The 360 team investigates a mysterious shark attack on a 10-year-old boy.

The 360 team investigates a devastating shark bite in Australia.

A spate of shark bites hits Long Island after 40 years, and experts explore why.

A day of surfing abruptly ends when a shark bites Elinor's surfboard.

Steve Backshall encounters a diverse world of sharks in the Atlantic.

Steve Backshall explores the Indian Ocean and its diverse wildlife.

Steve joins scientists to find shark hot spots in the Pacific Ocean.

Steve Backshall looks for the 30-plus sharks of the British Isles.

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The team investigates a beach known as the shark bite capital of the world.

A rash of rare shark attacks in the Gulf spark a major investigation.

Shark diving is a popular activity in the Bahamas, but after several incidents, tourist safety is called into question; experts investigate how human interaction affects shark behavior.

Encounters off Oahu spark investigations into tiger shark hunting patterns.

The team goes to California to investigate and study the rapidly growing population of great white sharks.

Shark experts investigate unusually high great white activity around a seal and sea lion colony off Australia's Greenly Island.

Scientists investigate why huge numbers of sharks gather in a dangerous lagoon on Australia's Great Barrier Reef, revealing a complex battleground.

At remote Norfolk Island in the South Pacific, shark experts Lauren Meyer, Adam Barnett and Charlie Huveneers investigate why tiger, dusky and Galápagos sharks gather here in such high numbers.

Shark experts Nico Lubitz and Adam Barnett head into the wilds of northeastern Australia to investigate reports of bull sharks and saltwater crocodiles clashing along the Daintree River.

Shark experts investigate a 3,000-year-old skeleton found in Japan with unusual cut marks that could be the earliest known victim of a shark attack.

A team of scientists and a cinematographer search the waters north of New Zealand to find giant mako; with the help of a local fisherman, who has worked this stretch of ocean for decades, they encounter a series of increasingly large mako sharks.

Shark experts discover what's behind the surge in massive sharks.

Two beach communities experience an unprecedented surge in shark attacks.

Researchers investigate why sharks attack surfers at such alarming rates.

Tag along with scientists from around the world as they examine unprecedented adaptions for shark superiority.

Two beach communities experience an unprecedented surge in shark attacks.

Researchers investigate why sharks attack surfers at such alarming rates.

Sharks are venturing closer to shore; examining the possibility of sharks living on the land.

Diving into the deep to get up-close with sharks.

Brazen shark attacks targeting people.

Multiple instances of sharks attacking humans in pairs.

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Venturing into a world of crazy-looking, oddly behaved and downright shocking sharks to discover a new side to these feared fish.

Finding out if great white sharks can change the color of their skin and camouflage themselves.

Expert teams go to extraordinary lengths to take shark science to the wild.

Ultra-athlete Ross Edgley pits himself against four legendary sharks.

Anthony Mackie uncovers a shark mystery with fishermen in Louisiana.

Chris Hemsworth investigates living harmoniously with sharks.

Bertie Gregory decides to journey to South Africa to go swimming and diving with some great white sharks.

In Mexico's Pacific waters, Bertie Gregory goes in search of a predator, the hammerhead shark; once abundant here, hammerhead numbers have declined enough that encounters are now rare.

Marine biologists investigate why sharks attack boats.

Scientists conduct a population study on great whites in California.

Two of the deadliest predators go head-to-head.

Sharks show up in unexpected places in what seems like a global invasion.

"Jaws" shocked audiences and continues to influence the world 50 years later.

Comedians and experts react to videos of the sharks that broke the Internet.

Using a new experimental diving cage, two shark biologists investigate rising reports of bull sharks stealing from fishermen in northern Australia.

Hawaii is shaken by three bizarre shark attacks in less than five months.

Los Angeles is shocked by four shark attacks in four months.

Ten shark attacks leave visitors reeling off Florida's Space Coast in 2003.

Three alarming shark attacks occur in the Bahamas in just thirty-nine days.

Two unlucky ocean lovers are attacked by sharks twice.

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See how one company is changing people's lives by helping them put their tax problems to rest.

Tag along with scientists from around the world as they examine unprecedented adaptions for shark superiority.

Investigating why people are having increasingly more encounters with sharks along the coastal waters of the United States.

Marine biologist Greg Skomal and meteorologist Joe Merchant test the theory that shark attacks can be as predictable as the weather.

After inventing armored suits for divers 40 years ago, Jeremiah Sullivan jumps back in the water to test out just how foolproof his latest creation really is against hungry hammerheads and deadly tiger sharks.

A rare event between top ocean predators was captured on video in Florida, bull sharks attacking a great hammerhead; Dr. Heithaus and a team of shark experts launch an investigation pinning one against the other.

Rare instances of predation on sharks by seals, crocodiles, octopi, bobcats and birds.

Up close with some of the largest great white and tiger sharks ever filmed.

Researchers investigate if orcas are hunting great whites in New Zealand.

A team of experts travels to Shark Bay, Australia, to unlock the secrets of shark and dolphin combat; cutting-edge technology provides a window into this seldom-seen conflict.

In the Bahamas, over 30% of dolphins have shark bite scars; using a non-toxic gel bite pad and a life-sized dolphin lure, a look at bite impressions of three species that could be predators.

Shark experts investigate a 3,000-year-old skeleton found in Japan with unusual cut marks that could be the earliest known victim of a shark attack.