Nsyilxcen, Nsəlxcin, or Okanagan, is a Native American language belonging to the Salish family originating from the Pacific north west and the Columbia Plateau of North America. Currently, it's recorded that Okanagan has around 800 or so speakers.
This fascinating language, but unfortunately, like so many Native languages, it is in great danger of going extinct.
If you'd like to help stop this from happening, here are some links to get you started:
Wikipedia on Okanagan
Okanagan National Alliance
First Voices: general article and Word list (with audio samples!)
Alphabet Video
A Story in Okanagan
Just a generally great channel for learning the Language (most specifically, the Coville dialect)
Here's another tale