Western Omo–Tana languages

The Omo–Tana or Arboroid languages belong to the Afro-Asiatic family and are spoken in Ethiopia and Kenya.
The languages are:

Arbore
Daasanach
El Molo
Yaaku

The first three have long been recognized as related; Bender adds Yaaku, whose classification had been obscure.
The El Molo language of Kenya is nearly extinct.