An English tourist vanishes while sunbathing on Fraser Island, Australia. A month later, dingoes attack two boys, killing one of them. What is happening on this island down under?

In parts of Florida, alligators are surging from waterways and ambushing people. Join our team of biologists, trauma physicians, and detectives as they investigate this disturbing outbreak of violence and explore details of alligator behavior.

In India, Bengal tigers stalk men in forest and spring upon fishermen as they ride the rivers. One tiger even has a target inside one of the local villages. Why are these wild tigers killing human beings?

On Alaska's Kodiak Island, hunters and tourists are suddenly faced with what seem to be unusually aggressive bears.

Examining attacks by great white sharks on humans in waters near South Africa.

Exploring reasons why a single lion preyed on humans along the Rufiji River in southern Tanzania, killing 49 people between 2000 and 2002. During the killing spree he was dubbed “Osama.”

In Ecuador's remote Amazonian village of Jatun Molino, something is mysteriously attacking and killing people. Within one month, two adults and five children are dead. The two victims that make it to the hospital are found to have rabies. The analysis indicates that it is the type of rabies comes from vampire bats. Vampire bats are known to feed on livestock when jungle prey is scarce. Why would the shy nocturnal creatures suddenly be targeting human beings? An international team probes further into the tragedy that grips the Quichua community. A comparison to similar cases other South American countries provides possible reasons why vampires would be forced to turn their thirsty attention to people.

An enormous saltwater crocodile attacks a group of tourists in the Australian outback. Why were these people swimming at night in croc-inhabited waters? Eyewitness accounts and forensic evidence yield disturbing answers

In a remote area of South Africa, a male baboon steals a baby from its bed. Why did this baboon take the child? Is this incident connected to the increasing conflicts between baboons and tourists in Cape Town?

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Enters dolphins' complex world of sexual aggression and social hierarchy to find out what causes these seemingly harmless animals to attack.

A rash of black bear attacks one Canadian summer has experts looking for answers. Through eyewitness accounts and detailed analysis of the attack scenes, we begin to piece together the puzzle. A bad berry crop the year after a drought is stressing the animals' food supply a spring hunting moratorium several years in a row has led to a surge in the number of young bruins an especially warm summer brings more people into bear country than ever before . But our investigation suggests a much more disturbing reason behind these attacksCould it be that some black bears have learned to see humans as prey?

Recife, Brazil, has miles of sandy beach, inviting waves, and the most shark attacks in the world. Investigators try to find out which ancient predator is the culprit, why the attacks began so suddenly, and what can be done to stop them.

In the heart of southern Africa lies the Okavango Delta, filled with lush vegetation and home to many of Africa's spectacular big game animals. The beauty of the Delta draws visitors like Bruce and Janice Simpson who have chosen this exotic location for their honeymoon. But in the blink of an eye, their amazing experience takes a horrific turn when their canoe is attacked by a fierce and deadly foe. Why has this place, normally tranquil and beautiful, become the setting for this horrible encounter? What has attacked them, and will it attack again?

On a cool July morning, in Tanzania's lush savannah, Bob Fontana shoulders his hunting rifle suddenly 2000 pounds of brute force bursts out of a nearby bush and tramples the man - its horns piercing the hunter's crumpled body. The culprit is legendary throughout Africa: The cape buffalo . But what has caused this normally placid grazer to attack a human? Chillingly, Fontana is not alone attacks by cape buffalo are occurring throughout the Dark Continent. But why?

Cougar attacks on humans happen more often on Canada's Vancouver Island than anywhere else. What is making the cougars here so dangerous? Experts investigate six attacks, including one on a four-year-old girl.

The American alligator is an efficient and opportunistic hunter, but seldom preys on humans. So when alligators attack three women in three different parts of Florida in one week, experts want to know why the hunter became the hunted.

Naturalist Vitaly Nikolaenko worked in close proximity to brown bears for 30 years -- until one viciously killed him. Could it have been a shortage of food or did Vitaly?s own actions spark the attack? NGC sheds light on what actually happened.

Russia's Far East is famous for its long and brutal winters, and the undisputed king of this frozen domain is the Siberian Tiger. Hunted almost to extinction, there are now only 500 of these elusive cats left in the wild , and they are spread out across almost 70,000 miles of wilderness . Incredibly stealthy with a killer camouflage, these tigers are rarely seen. But when a researcher is suddenly attacked in the vast frozen forest, Investigators are left scratching their heads. As the researcher battles for his life, our investigators analyze a rash of similar attacks in the area. What they discover only adds to the mystery. What is causing these normally elusive cats to come out of hiding and attack humans? And is the real predator the tiger or the man?

In West Africa's Sierra Leone, a chimp charges a touring car, breaks a window and bites one of the passengers. What provoked such violent aggression?