1. Bornean orangutans: primary forest in Danum Valley and rehabilitation program on Orangutan Island

   • Tetsuro Matsuzawa

   Editorial 03 November 2019 Pages: 477 - 483

   

2. The Primates 2019 Most-Cited Paper Award

   • Tetsuro Matsuzawa

   Editorial 05 November 2019 Pages: 485 - 486

   

3. Social hair plucking is a grooming convention in a group of captive bonobos (Pan paniscus)

   • Colin M. Brand
   • Linda F. Marchant

   News and Perspectives 30 September 2019 Pages: 487 - 491

   

4. Water games by mountain gorillas: implications for behavioral development and flexibility—a case report

   • Raquel Costa
   • Misato Hayashi
   • Masaki Tomonaga

   News and Perspectives 29 August 2019 Pages: 493 - 498

   

5. Signaling across the senses: a captive case study in pair-bonded red-bellied lemurs (Eulemur rubriventer) at the Duke Lemur Center, NC, USA

   • Britt Singletary
   • Stacey Tecot

   News and Perspectives 24 October 2019 Pages: 499 - 505

6. Social relationships and greetings in wild chimpanzees (Pan troglodytes): use of signal combinations

   • Eva Maria Luef
   • Simone Pika

   Original Article 24 September 2019 Pages: 507 - 515

   

7. Chimpanzees use observed temporal directionality to learn novel causal relations

   • Claudio Tennie
   • Christoph J. Völter
   • Michael Tomasello

   Original Article Open access 23 September 2019 Pages: 517 - 524

   

8. Longevity and mortality of captive chimpanzees in Japan from 1921 to 2018

   • Kristin Havercamp
   • Koshiro Watanuki
   • Satoshi Hirata

   Original Article 03 October 2019 Pages: 525 - 535

   

9. Prevalence of gastrointestinal parasites in lion-tailed macaque Macaca silenus in central Western Ghats, India

   • Shanthala Kumar
   • Honnavalli Nagaraj Kumara
   • Palanisamy Sundararaj

   Original Article 29 August 2019 Pages: 537 - 546

   

10. Salivary alpha-amylase enzyme is a non-invasive biomarker of acute stress in Japanese macaques (Macaca fuscata)

    • Nelson Broche Jr.
    • Rafaela S. C. Takeshita
    • Michael A. Huffman

    Original Article 20 September 2019 Pages: 547 - 558

    

11. Anointing with commercial insect repellent by free-ranging Cebus capucinus in Manuel Antonio National Park, Quepos, Costa Rica

    • Edilton R. Santos
    • Stephen F. Ferrari
    • Gustavo A. Gutiérrez-Espeleta

    Original Article 22 August 2019 Pages: 559 - 563

    

12. Genetic differentiation and diversity of the Bolivian endemic titi monkeys, Plecturocebus modestus and Plecturocebus olallae

    • Julia Barreta Pinto
    • Jesús Martinez
    • Robert Wallace

    Original Article 10 September 2019 Pages: 565 - 573

    

13. The Goodness Paradox: How evolution made us more and less violent, by Richard Wrangham

    • William C. McGrew

    Book Review 20 September 2019 Pages: 575 - 576

14. Correction to: Shape variation in the facial part of the cranium in macaques and African papionins using geometric morphometrics

    • Takeshi Nishimura
    • Naoki Morimoto
    • Tsuyoshi Ito

    Correction 25 September 2019 Pages: 577 - 577

15. Acknowledgements

    Acknowledgements 04 October 2019 Pages: 579 - 580