The Pirahã language of South America can also be whistled or hummed, and has other interesting characteristics , like lacking words for numbers: https://en.wik

The Pirahã language of South America can also be whistled or hummed, and has other interesting characteristics , like lacking words for numbers: https://en.wikipedia.org/wiki/Pirah%C3%A3_language https://en.wikipedia.org/wiki/Pirah%C3%A3_language