Want more natural history and wildlife videos? Visit the official BBC Earth channel: http://bit.ly/BBCEarthWW'>http://bit.ly/BBCEarthWW

BBC Earth
The BBC Earth YouTube channel is home to over 50 yearsworth of the best animal videos from the BBC archive. With three new videos released every week there’s something for all nature loves from astounding animal behaviour to beautiful imagery. Click here to find our more: http://bit.ly/BBCEarthWW'>http://bit.ly/BBCEarthWW

David Attenborough looks at how the cuckoo duck ensures its survival in another bird's nest. From the BBC.

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