Orangutans regularly build nests (Prasetyo et al., 2009) like other great apes (Fruth & Hohmann, 1996). Nests are mainly constructed to provide a place for resting and protection from potential risks such as predation, heat loss, and parasites carried by insects like mosquitoes (McGrew, 2004). Immature orangutans acquire sufficient nestbuilding skills before separating from the mother (van Noordwijk et al., 2009). As the body size, cognition, and safety requirements continue to develop following infancy, the nest-building skills probably continue to be refined into adulthood (for more details, see Russon et al., 2007). Juvenile and adolescent orangutans are believed to acquire nesting skills through horizontal and/or modes of social transmission (Russon et al., 2007). Thus, nesting behaviour is generally reported as a cultural variants in orangutans, with 9 of the 35 cultural behavior variants showing nesting behaviour (van Schaik, 2009). Leaf-carrying behaviour, which is defined as the collection of nest materials before reaching the nest site (rather than afterwards), is a newly identified variant of orangutan nest-building behaviour (Russon et al., 2007; van Schaik et al., 2009). For example, Russon and colleagues (2007) showed the acquisition processes of leaf-carrying behaviour at some rehabilitation/re-introduction sites. However, literature reporting the occurrence of nest building and branch (or leaf) carrying behaviour in the wild remains scarce (Russon et al., 2007), although studies do exist on nest-site selection (i.e. preferred sites) and preference of species of nesting-tree (Sugardjito, 1983; Ancrenaz et al., 2004; Prasetyo et al., 2009). This report describes the direct observation of a single adult female orangutan in the wild that carried large numbers of fruit-laden branches for both feeding and nesting.