What explains the shape of Zauzou noun phrases? Zauzou (Trans-Himalayan, China) noun phrases exhibit considerable diversity in both the choice of the phrase's primary reference type, and the presence of classifiers, demonstratives, modifiers, and case marking. This investigation uses a large, previously existing Zauzou textual corpus. The corpus was annotated for variables hypothesized to predict the variation in noun phrase form. Syntactic variables investigated include word order, subordination, subordinate role, and a new variable called "loneliness." Participant semantic variables include thematic role, agency, and affectedness. Referential semantic variables include boundedness, number, and animacy. The information packaging variable investigated is accessibility. Statistical analysis of the corpus revealed that case marking was predicted using a variable called "loneliness." This is where a multivalent verb has only one argument that is explicitly referenced in the clause. Lonely noun phrases are more likely to be case marked. The role of loneliness in motivating case marking confirms that disambiguation can be an explanation for differential case marking. Animacy and accessibility are important predictors of noun phrase weight. Overall, high animacy and high accessibility correspond to reduced noun phrase weight. Agency and thematic role were also significant variables. The Zauzou data makes clear that speech act …