Anyone know what instrument or singing this is?

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In [this](https://soundcloud.com/flicflac/vance-joy-riptide-flicflac) riptide remix sometimes it sounds like someone is whistling? I can’t tell if it’s whistling or an instrument and if so, which instrument, would anyone know? Thank you.
For example go to 1:11 in the song to see what I am talking about

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