Piraha

Piraha is a language spoken by the Piraha people along the Maici River, a tributary of the Amazon, in Amazonas state, Brazil. It was formerly regarded as the sole surviving member of the small Mura language family, though it is now most often treated as a language isolate. With roughly 250 to 380 speakers as of 2009, the community remains largely monolingual, and the language has drawn considerable scholarly attention for claims, associated especially with the linguist Daniel Everett, that it lacks recursion and dedicated number words, features some researchers argue challenge assumptions in universal grammar, though these claims remain disputed.