Ka'apor language

Kaapor (Ka’apor, Kaaporté), also known as "Urubú" or Urubú-Kaapor, is a Tupi–Guarani language spoken in French Guiana and Brazil.

There is a high incidence of congenital deafness among the the Kaapor people, most of whom grow up bilingual in Urubu-Kaapor Sign Language, which may be indigenous to them.