A camper is attacked in Alaska, and a tourist killed in Norway. On both occasions the assailant has been a bear. As attacks become more common, scientists examine the causes of this behaviour.

After 30 years of observing brown bears in Russia, Vitaly Nikolaenko was killed by one of these giant animals. An investigation tries to uncover why Vitaly ignored the warning signs.

The brush land of South Africa is a dream destination for eco-tourists, but when a group of them are suddenly attacked, investigators look at similar attacks in the region for clues as to why.