In the coastal town of Laguna, Brazil, a strong bond has formed between wild dolphins and local fishermen over generations. The dolphins herd schools of fish towards the shoreline and then give distinct signals telling the fishermen when to cast their nets.

At a privately-owned wildlife park in South Africa, Or Lazmi has integrated herself into a group of four lions. Having known her since they were cubs, the lions treat her as a dominant figure and allow her to get extremely close.

More than 800 million people around the world use the social media video platform TikTok. However, some governments around the world are concerned that the Chinese-owned app allows the Chinese government to access people's data.

The European Union says it will begin shipping arms to Ukraine. This is the first time in its history that it has supplied arms in a conflict.

President Vladimir Putin has put Russia's nuclear forces on high alert. The theory is that the possibility of mutually assured destruction is the strongest of reasons not to press the button. But the pressure is mounting.

Strict water restrictions come into force for millions of people in California as the US west coast continues to experience a crippling drought.

People are increasingly interested in seeing animals in natural settings, so traditional jail-like zoos are giving way to open-plan zoos, and to eco-tourism.

Barbary macaques are among the most popular tourist attractions in Gibraltar. The apes have a taste for junk food, which enables tourists to see them up close and allows scientists to easily capture them for research.

We leave the macaques in Gibraltar to travel to the Galapagos Islands to learn about marine and land iguanas.

The segment focuses on the alien striped iguanas of the Galapagos Islands, albinism in a variety of animals, and the peppered moth.

The last segment focuses on Australia. We visit the Warrawong Earth Sanctuary, where there are breeding programs to reintroduce such indigenous animals as bandicoots and quolls, creatures that came close to extinction.

There's been some bad news for the Great Barrier Reef, with experts declaring another mass bleaching—the fifth in just eight years. We find out what coral bleaching is and how it's impacting Australia's World Heritage-listed wonder.

In the next 35 years, we’ll have to produce more food than all of the world’s production over the last 2000 years combined. So what will the farms of the future look like?

Prime Minister David Cameron will step down by October after the UK voted to leave the European Union. Mr. Cameron made the announcement in a statement outside Downing Street, in which he said he will attempt to "steady the ship" over the coming weeks and months, but that "fresh leadership" is needed.

"Brexit" is a portmanteau that blends "Britain" and "exit", and refers to Britain leaving the European Union. The decision was made by referendum, in which a narrow majority of British voters chose to leave the European Union. This video (part 1 of 3) succinctly outlines the plans that Britain's Prime Minister and the Members of Parliament are grappling with on the eve of Britain's exit from the European Union on March 29, 2019.