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meaning that human observers were also there on a regular basis. Second, because Psydrax trees are relatively short with sparse canopies, it was easy for the observer to notice the dead body. We may not have been able to notice the remains if a higher and denser-canopied tree were involved or in a place less frequented by the chimpanzees. In such cases, we cannot solve the disappearances of infants. This dilemma poses the distinct possibility that arboreal deaths may be more common than we know. ACKNOWLEDGEMENTS We would like to thank COSTECH, TAWIRI, and TANAPA for their permission to conduct long-term research at Mahale. Demography, female life history, and reproductive profiles among the chimpanzees of Mahale. 2008. Arboreal nesting as anti-predator adaptation by savanna chimpanzees (Pan troglodytes verus) in southeastern Senegal. Am J Primatol 70:393–401. Stewart FA, Pruetz JD 2013. Do chimpanzee nests serve an anti-predatory function? Am J Primatol 75:593–604. Takemoto H 2004. Seasonal change in terrestriality of chimpanzees in relation to microclimate in the tropical forest. A case report about the death accident of captive chimpanzee infant. Primate Res 10:321–331, in Japanese with English summary.

<Note> Responses of Wild Chimpanzees to Fresh Carcasses of Aardvark (Orycteropus afer) in Mahale