A newborn cuckoo's instinct is to remove from its adopted nest any of the warbler's eggs. But more sinister is cuckoo's removal of the warbler's own newborn chick. Fascinating clip from the BBC's wildlife series Natural World. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here:    / bbcearth  

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