Several languages in the world alternate between marked and unmarked objects with respect to different properties of the noun, including animacy and specificity. This phenomenon is called...Show moreSeveral languages in the world alternate between marked and unmarked objects with respect to different properties of the noun, including animacy and specificity. This phenomenon is called differential object marking. In this thesis, I describe the differential object marking system of Cha’palaa, a Barbacoan language spoken in Ecuador, and compare this with the differential object marking systems of the related Barbacoan languages. It can be concluded that in three of the four languages, including Cha’palaa, differential object marking is only governed by specificity. In one language, namely Awa Pit, differential object marking is governed by both animacy and specificity.Show less