Since being fitted with a satellite tag by the BTO four years ago, Chris the cuckoo, named after TV Wildlife Presenter Chris Packham, has travelled over 60,000 miles - the equivalent of flying twice round the world, and he's taken in 22 different countries along the way! We have lost a staggering 72% of our Cuckoo population over the last 25 years; In a bid to find out what's driving this decline...

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