Scotland's ospreys are approaching Guinea-Bissau on their epic Autumn migration. A team of conservationists, led by biologist and adventurer Sacha Dench, is following them on their 5000km odyssey. Sacha wants to raise awareness of the multiple threats that migrating birds face in a time of rising populations and a warming climate.

Emily Knight hears from Sacha as the ospreys and their support team approach the end of the journey, and go on the hunt for celebrity osprey 4K, who they've been trailing all the way from Leicestershire.

Produced by Alasdair Cross and Emily Knight Show less