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Willem-Pier Vellinga is a scientist from the Netherlands who almost by accident became the guardian of the largest collection of bird sounds in the world. He now runs a website called Xeno-Canto, a growing collection of bird sounds where people from all over the world have posted recordings of cheeps, tweets, songs and warbles. Last month it reached 400,000 recordings. Outlook's Gibby Zobel went to meet him. Image: Willem-Pier Vellinga Credit: Rob Buiter