Scientists use GPS to track nightingales

Scientists have put GPS tags on nightingales in Cambridgeshire - to track their migration to Africa, in the hope of boosting their numbers. The number of nightingales in the UK has more than halved since 1995.

By tracking their migration from the Anglian Water nature reserve at Grafham, experts believe they can increase the birds' chances of survival. Here's Stuart Leithes report...