Tagged cuckoo
Media playback is unsupported on your device

Cuckoo decline finally mapped

Forty-two tiny tracking devices fitted to cuckoos in the UK may have solved the mystery of the birds' decline.

Britain has lost more than 70% of its cuckoos in the past 25 years.

A study tracking their migration has now revealed that the birds have two migration routes - and one appears to be more risky than the other.

The findings are published in the journal Nature Communications.

  • 19 Jul 2016
Go to next video: Why are cuckoo numbers falling?