In 2016, the Philippines’ newly elected president, Rodrigo Duterte declared there was one, common enemy: the drugs trade. What followed was a bloodbath. Addicts, alleged traffickers – and so many who happened to be in the wrong place at the wrong time – were gunned down in the streets by the security services. Often, the police claimed there had been a shoot-out and they had shot back in self-defence. The government put the number of people killed in the ‘war on drugs’ at 6,252 – that figure doesn’t include the thousands killed by unknown assailants.

Some people said it was created by Peruvian scientists, that it gorged on the blood of farm animals, that it was a monster. Many myths have grown up in Bolivia around the Paiche, one of the world’s largest scaled freshwater fish which is native to Amazonian rivers of Brazil and Peru and can grow up to four metres long. But after young fish were accidentally released from a Peruvian fish farm, the Paiche has arrived big time in Bolivian rivers.

Every year, it reaches another 40 km of river and is eating all before it, especially smaller native fish stocks including even the deadly piranha. At the same time, the Paiche is proving a boon to many local fisherman who sell it to families and restaurants who are acquiring a taste for it in a land-locked country where meat has always been the favourite form of protein. This gives scientists and the authorities a dilemma. Do they try and control or even eradicate the Paiche from rivers famed for their biodiversity where new species are being identified all the time? Or let its spread continue unabated and provide a useful livelihood for fishermen and a healthy addition to the Bolivian diet? For Crossing Continents, Jane Chambers takes to the rivers of Bolivia

Produced by Bob Howard

Rebuilding Ukraine after the destruction inflicted by Russia will be a gigantic task. Foreign donors have pledged billions of dollars. But they want reassurances that the money will be properly spent, in a country which still has high levels of corruption. For Crossing Continents Tim Whewell visits Bucha, near the capital Kyiv, site of some of the worst Russian atrocities, to see the beginning of reconstruction. A series of shocking reports by Ukrainian journalists into alleged misuse of rebuilding funds have forced local authorities in the area to explain themselves. But a new state reconstruction agency committed to transparency has now also started work in Bucha. And anti-corruption campaigners believe a new digital accounting and monitoring system they are developing in collaboration with the authorities will help turn Ukraine into a world beacon of openness. The government's slogan is "build back better." But what exactly does that mean? And can it be achieved?

Produced and presented by Tim Whewell

As hundreds of thousands of Ukrainian soldiers defend their country against Russia, many patriotic civilians are engaged in a struggle that's less risky, but that they believe is also vital. They’re battling for a fairer, less corrupt Ukraine, worthy of its heroes.

Produced and presented by Tim Whewell

Cyprus is one of the main resting stops for songbirds as they migrate between Europe, Africa and the Middle East. For centuries, Cypriots trapped and ate a small number of migrating songbirds, as part of a subsistence diet. But over recent decades, the consumption of songbirds became a lucrative commercial business and the level of slaughter reached industrial levels . Millions of birds were killed each year as trappers employed new technologies to attract and capture birds. The methods used by the trappers are illegal under both Cypriot and EU law. In the last few years, both the Cypriot authorities and environmental groups have been fighting back, dramatically reducing the number of birds being trapped. But it remains a multi-million dollar illegal business which has increasingly drawn in organised criminal gangs. For Crossing Continents, Antonia Bolingbroke-Kent sees the trappers in action, and meets those determined to stop the mass killing of birds.

Presenter: Antonia Bolingbroke Kent

Crossing Continents reports from Poland’s eastern frontier, where the Polish government has built a steel border wall - 186 kilometres long and five metres high, it’s meant to stop global migrants from Asia and Africa trying to cross from the Belarusian side. But the wall cuts straight through the Białowieza forest - the largest remaining stretch of primeval forest in Europe, which is also a UNESCO world heritage site.

Grzegorz Sokol meets environmental scientists, activists and local villagers each with their point of view. Women like Kasia Mazurkiewicz-Bylok who treks into the forest with a rucksack of supplies to try to help migrants lost in the dense, trackless forest. Or Kat Nowak, a biologist trying to log the precise effects of the wall - from the plant species brought in with the gravel for the foundation, to the possible effects on wolf behaviour.

The deep and dark forest of Białowieza seems to have lain undamaged by humans since it began to grow more than 12,000 years ago. But this remote part of Poland is in reality no stranger to upheaval. Caught in the fault lines of wars and revolution throughout the 20th century, the forest's villages have been razed more than once. Villagers have been murdered, forced to flee and become refugees themselves. As Grzegorz explores the forest, these hidden histories feel ever more present.

Producer Monica Whitlock

Americans on both sides of the political spectrum are escaping states they no longer feel comfortable in - they’re calling themselves ‘political refugees’. And the sunshine state of Florida is at the heart of this political sorting.

How can one US state be both a safe haven for Americans fleeing their homes in the north and a dangerous threat to liberal families?

From Miami to Chicago, Lucy Proctor traces the journeys of America’s homegrown refugees, meeting progressives and conservatives making their move. Through their crossing paths, she explores what is behind this new wave of domestic migration, and what it might mean for America’s future.

Presenter: Lucy Proctor

Kirkenes, in the far north-east of Norway, once thrived on its close ties with neighbouring Russia. All that changed after the invasion of Ukraine. Now it’s become home to Ukrainian refugees and a safe haven for some Russian journalists escaping President Putin’s media clampdown.

Producer: Alex Last

There are one hundred thousand missing Syrians, according to the UN, who’ve been detained or have disappeared since the beginning of the uprising in Syria twelve years ago and the civil war that followed. Most of their families have no idea where they are and whether they’re alive or dead. Many are paying thousands of dollars for information about them which almost always comes to nothing. Lina Sinjab reports from Turkey and Beirut where she’s been talking to Syrian refugees about the desperate measures they'll go to in their search for their missing relatives.

Presenter: Lina Sinjab

In the early hours of 14th June, a heavily overcrowded, rusty fishing trawler carrying as many as 750 migrants capsized off the coast of Greece. The passengers - men, women and children from countries including Pakistan, Egypt and Syria - were fleeing conflict and poverty, hoping to start safer and more prosperous lives in Europe.