Roe Whistle (Pinyin: ní wa wū), also known as birch bark whistle, Picaraan, Oroqen, Ewenki, Daur and other ethnic edge air-sounding instruments, made of birch bark, popular in the Oroqen Autonomous Banner of Hulunbuir League, Inner Mongolia Autonomous Region, Ewenki Autonomous Banner, Moli Dawa Daur Autonomous Banner, Butha Banner, Huma, Xunk and other places in Heilongjiang Province.

The roe deer whistle is folded from a piece of birch bark. The bark is 5 cm long and 2 cm wide. Fold it in half and cut it with scissors into a flat shape on the upper arc and the lower part, like a half thumb. The periphery is pasted with gum, leaving a gap at the top of the arc. For the mouthpiece, the mouthpiece is 0.4 cm to 0.6 cm long and 0.2 cm wide. Two roe deer whistle are tied side by side, that is, double roe deer whistle.

The roe deer whistle was originally used as a hunting instrument, but now it has become a "matchmaker" for young men and women in love.