Bijago

Bijago is highly divergent. Sapir (1971) classified it as an isolate within West Atlantic. However, Segerer showed that this is primarily due to unrecognized sound changes, and that Bijago is in fact close to the Bak languages. For example, the following cognates in Bijago and Joola Kasa

Kasa language

Kasa, or Jóola-Kaasa is a Jola language of the Casamance region of Senegal and neighboring Gambia....

(one of the Jola languages) are completely regular, but had not previously been identified:

Gloss	Bijago	Joola Kasa
head	bu	fu-kow
eye	nɛ	ji-cil