Flarin Big Lake is a member of the Crow Tribe. Flarin is the last Deaf Deaf person in Crow Tribe who uses Crow Sign Language (language variety of Plains Sign Language). He kindly emphasizes PISL is not a nationwide native sign language. It’s used in the plains area – Crow, Cheyenne, Flathead, Rocky Boy, etc.
Comparing the sign differences between American Sign Language & Crow Sign Language