Hirata, Fuwa, and Myowa (Royal Society Open Science, 4; 170370, 2017) extended to chimpanzee subjects a paradigm that had been developed by Povinelli and colleagues (Povinelli, Landau, Child Development, 67; 1540-1554, 1996; Perilloux, Povinelli & Simon, Developmental Psychology, 34, 188-194, 1998) to demonstrate the concept of self-continuity in young children. However, Hirata and colleagues lacked critical controls that would have allowed the conclusion that some of their chimpanzees recognized themselves in the time-delayed videos.
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Investigating infant feeding development in wild chimpanzees using stable isotopes of naturally shed hair.
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Measuring the relative contributions of milk and non-milk foods in the diets of primate infants is difficult from observations. Stable carbon (δC) and nitrogen (δN) isotopes in hair can be used to physiologically track infant feeding through development, but few wild studies have done so, likely due to the difficulty in collecting hair non-invasively. We assessed infant feeding at different ages in wild chimpanzees (Pan troglodytes) at Ngogo, Uganda using δC and δN of keratin in 164 naturally shed hairs from 29 infants (61 hairs), 6 juveniles (7 hairs), 28 mothers (67 hairs) and 14 adult males (29 hairs).
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Learn Behav
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Hirata, Fuwa, and Myowa (Royal Society Open Science, 4; 170370, 2017) extended to chimpanzee subjects a paradigm that had been developed by Povinelli and colleagues (Povinelli, Landau, Child Development, 67; 1540-1554, 1996; Perilloux, Povinelli & Simon, Developmental Psychology, 34, 188-194, 1998) to demonstrate the concept of self-continuity in young children. However, Hirata and colleagues lacked critical controls that would have allowed the conclusion that some of their chimpanzees recognized themselves in the time-delayed videos.
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