Attapady Kurumba (IPA:[ɐʈːɐpːaːɖikurum(b)ɐ]), also called Pal Kurumba or Palu Kurumba, is an unclassified Southern Dravidian language spoken by a Scheduled tribe of India. It shows only approximately 50% lexical similarity with the other South Dravidian languages named Kurumba, but up to 82% with Muduga and 52% with Kannada Kurumba; Attapady Kurumba, Muduga, and Irula each use their mother tongue when speaking to each other. Thudukki variety of Attapady Kurumba is reportedly most pure.[1]
Shyam, S. K.; Ravindran, P.N.; Syama, C.G. (2017). Descriptive Grammar of Muduga and Kurumba. Calicut: KIRTADS (Kerala Institute for Research Training & Development studies). pp.107–308 (Kurumba language).
Kapp, Dieter B. (2019). Pālu-Kuṟumba: Grammatik, Textproben und Wörterbuch. Beiträge zur Kenntnis südasiatischer Sprachen und Literaturen (in German). Vol.30. Harrassowitz Verlag. ISBN9783447112444. ISSN0948-2806.