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Since the Cuban Revolution of 1959 there have been many swells – and ebbs – of migration from the island. But as its people endure a serious economic squeeze and a crackdown on dissent, the desire to leave is growing again. Recently the numbers of Cubans arriving at US borders have been rising sharply, and President Biden's administration has announced some relaxations to its visa policy for Cubans. Will Grant reports from Havana on why some Cubans now feel it’s time for them to pack up and go.

The Nile perch – an energetic predator fish with a ravenous appetite – once fuelled a boom in fishing on Lake Victoria in east Africa. Around the lake’s shore, crews put out to haul lucrative catches from the waters. But these days the boom has collapsed, the perch are scarcer and smaller, and profits have dwindled too. Mark Weston went out on a night’s work with one Tanzanian fishermen and was left wondering if there’s much future in the business.

Land predators can be even more controversial. In Yellowstone National Park, in the USA, the native population of grey wolves was wiped out in the 1920s – but reintroduced in the 1990s. Since then they’ve flourished – and the park was called an 'international rewilding success story'. But as Emilie Filou found out, while tourists and park visitors wonder at the wolves, some local ranchers and farmers still consider them a pest – and call for more wolves to be hunted.

How can you change nationalities several times over, without ever moving house? It depends when and where you’re born. Monica Whitlock recently visited a village in Poland which has belonged to people of many nations – and stayed the night in a castle of many lands.

Producer: Polly Hope
Production Co-Ordinator: Iona Hammond
Editor: Richard Fenton-Smith