Now showing items 1-8 of 8

    • Chimpanzee Alarm Call Production Meets Key Criteria for Intentionality 

      Schel, Anne Marijke; Townsend, Simon W.; Machanda, Zarin; Zuberbühler, Klaus; Slocombe, Katie E. (Public Library of Science, 2013)
      Determining the intentionality of primate communication is critical to understanding the evolution of human language. Although intentional signalling has been claimed for some great ape gestural signals, comparable evidence ...
    • Distribution of a Chimpanzee Social Custom Is Explained by Matrilineal Relationship Rather Than Conformity 

      Wrangham, Richard W.; Koops, Kathelijne; Machanda, Zarin Pearl; Worthington, Steven; Bernard, Andrew B.; Brazeau, Nicholas F.; Donovan, Ronan; Rosen, Jeremiah; Wilke, Claudia; Otali, Emily; Muller, Martin N. (Elsevier BV, 2016)
      High-arm grooming is a form of chimpanzee grooming in which two individuals mutually groom while each raising one arm. Palm-to-palm clasping (PPC) is a distinct style of high-arm grooming in which the grooming partners ...
    • Enamel Thickness in Bornean and Sumatran Orangutan Dentitions 

      Smith, Tanya; Kupczik, Kornelius; Machanda, Zarin Pearl; Skinner, Matthew M.; Zermeno, John P. (Wiley, 2012)
      Dental enamel thickness has received considerable attention in ecological models of the adaptive significance of primate morphology. Several authors have theorized that the degree of enamel thickness may reflect selective ...
    • First Molar Eruption, Weaning, and Life History in Living Wild Chimpanzees 

      Smith, Tanya; Machanda, Zarin Pearl; Bernard, Andrew B.; Donovan, Ronan M.; Papakyrikos, Amanda M.; Muller, Martin N.; Wrangham, Richard W. (Proceedings of the National Academy of Sciences, 2013)
      Understanding dental development in chimpanzees, our closest living relatives, is of fundamental importance for reconstructing the evolution of human development. Most early hominin species are believed to show rapid ...
    • Phylogenetic Rate Shifts in Feeding Time During the Evolution of Homo 

      Organ, Chris Lee; Nunn, Charles Lindsay; Machanda, Zarin Pearl; Wrangham, Richard W. (National Academy of Sciences, 2011)
      Unique among animals, humans eat a diet rich in cooked and nonthermally processed food. The ancestors of modern humans who invented food processing (including cooking) gained critical advantages in survival and fitness ...
    • Predation by Female Chimpanzees: Toward an Understanding of Sex Differences in Meat Acquisition in the Last Common Ancestor of Pan and Homo 

      Gilby, Ian; Machanda, Zarin; O'Malley, Robert; Murray, Carson; Lonsdorf, Elizabeth; Walker, Kara; Mjungu, Deus; Otali, Emily; Muller, Martin; Emery Thompson, Melissa; Pusey, Anne; Wrangham, Richard (Elsevier BV, 2017-09)
      Among modern foraging societies, men hunt more than women, who mostly target relatively low-quality, reliable resources (i.e., plants). This difference has long been assumed to reflect human female reproductive constraints, ...
    • Primate Extinction Risk and Historical Patterns of Speciation and Extinction in Relation to Body Mass 

      Matthews, Luke J.; Arnold, Christian; Machanda, Zarin Pearl; Nunn, Charles Lindsay (Royal Society of London, 2011)
      Body mass is thought to influence diversification rates, but previous studies have produced ambiguous results. We investigated patterns of diversification across 100 trees obtained from a new Bayesian inference of primate ...
    • Response To: Chimpanzee Culture Extends Beyond Matrilineal Family Units 

      Wrangham, Richard; Worthington, Steven; Bernard, Andrew; Koops, Kathelijne; Machanda, Zarin; Muller, Martin (Elsevier BV, 2017-06)
      We thank van Leeuwen et al. for their response to our finding that matrilineal relationships strongly influence the style of high-arm grooming in wild chimpanzees of the Kanyawara community. We agree with them that grooming ...