1. New editorial board 2021–2023

   • Tetsuro Matsuzawa

   Editorial 05 January 2021 Pages: 1 - 2

   

2. The Primates 2020 Social Impact Award

   • Tetsuro Matsuzawa

   Editorial 06 January 2021 Pages: 3 - 4

   

3. A first report of separation calls in southern yellow-cheeked gibbons (Nomascus gabriellae) in captivity

   • Michal Hradec
   • Gudrun Illmann
   • Petra Bolechová

   News and Perspectives 24 October 2020 Pages: 5 - 10

   

4. Mixed-species associations and attempted mating suggest hybridization between purple-faced and tufted gray langurs of Sri Lanka

   • Amy Lu
   • Don Geethal Ramyanath Sirimanna
   • Roberta Salmi

   News and Perspectives 17 August 2020 Pages: 11 - 17

   

5. Age and sex differences in juvenile bonobos in party associations with their mothers at Wamba

   • Kazuya Toda
   • Heungjin Ryu
   • Takeshi Furuichi

   Original Article 12 August 2020 Pages: 19 - 27

   

6. Object sorting into a two-dimensional array in humans and chimpanzees

   • Misato Hayashi
   • Hideko Takeshita

   Original Article 29 July 2020 Pages: 29 - 39

   

7. Suspected Sunda clouded leopard (Neofelis diardi) predation attempts on two reintroduced Bornean orangutans (Pongo pygmaeus wurmbii) in Bukit Batikap Protection Forest, Central Kalimantan, Indonesia

   • Jacqueline L. Sunderland-Groves
   • Maryos V. Tandang
   • Jamartin Sihite

   Original Article 04 July 2020 Pages: 41 - 49

   

8. Diagnostic evaluation of fatal Balamuthia mandrillaris meningoencephalitis in a captive Bornean orangutan (Pongo pygmaeus) with identification of potential environmental source and evidence of chronic exposure

   • Shawna J. Hawkins
   • Jason D. Struthers
   • Gary West

   Original Article 12 September 2020 Pages: 51 - 61

   

9. Sleeping trees and sleep-related behaviours of the siamang (Symphalangus syndactylus) in a tropical lowland rainforest, Sumatra, Indonesia

   • Nathan J. Harrison
   • Ross A. Hill
   • Amanda H. Korstjens

   Original Article Open access 27 July 2020 Pages: 63 - 75

   

10. White-handed gibbons (Hylobates lar) alter ranging patterns in response to habitat type

    • Lydia E. O. Light
    • Tommaso Savini
    • Thad Q. Bartlett

    Original Article 03 September 2020 Pages: 77 - 90

    

11. Male–male social bonds predict tolerance but not coalition formation in wild Japanese macaques

    • Tatsuro Kawazoe

    Original Article 22 June 2020 Pages: 91 - 101

    

12. Inter-individual variation in the diet within a group of Japanese macaques and its relationship with social structure investigated by stable isotope and DNA analyses

    • Toru Oi
    • Shin-ichiro Hamasaki
    • Yoshi Kawamoto

    Original Article 02 July 2020 Pages: 103 - 112

    

13. Molecular histology of spermatogenesis in the Japanese macaque monkey (Macaca fuscata)

    • Sawako Okada
    • Kota Kuroki
    • Masanori Imamura

    Original Article 17 August 2020 Pages: 113 - 121

    

14. Behavioral mimicry predicts social favor in adolescent rhesus macaques (Macaca mulatta)

    • Jordan A. Anderson
    • Erin L. Kinnally

    Original Article 19 September 2020 Pages: 123 - 131

    

15. Selecting between iron-rich and clay-rich soils: a geophagy field experiment with black-and-white colobus monkeys in the Budongo Forest Reserve, Uganda

    • Paula A. Pebsworth
    • Thibaud Gruber
    • Sera L. Young

    Original Article 16 July 2020 Pages: 133 - 142

    

16. A comparative evaluation of thermal camera and visual counting methods for primate census in a riparian forest at the Lower Kinabatangan Wildlife Sanctuary (LKWS), Malaysian Borneo

    • Amaziasizamoria Jumail
    • Liew Thor-Seng
    • Danica J. Stark

    Original Article 22 June 2020 Pages: 143 - 151

    

17. The Lisu people’s traditional natural philosophy and its potential impact on conservation planning in the Laojun Mountain region, Yunnan Province, China

    • Jie Liu
    • Dejing Li
    • Satoshi Hirata

    Original Article 27 July 2020 Pages: 153 - 164

    

18. Fruit availability has a complex relationship with fission–fusion dynamics in spider monkeys

    • Kayla S. Hartwell
    • Hugh Notman
    • Mary M. S. M. Pavelka

    Original Article 10 September 2020 Pages: 165 - 175

    

19. Molecular phylogenetic inference of the howler monkey radiation (Primates: Alouatta)

    • Esmeralda D. Doyle
    • Ivan Prates
    • Eugene E. Harris

    Original Article 02 September 2020 Pages: 177 - 188

    

20. A high-diversity primate community in a mid-elevation flooded forest, the Jungla de Los Monos Community Reserve, Peru

    • Sam Shanee
    • Nestor Allgas
    • Noga Shanee

    Original Article 10 June 2020 Pages: 189 - 197

    

21. For emergency only: terrestrial feeding in Coimbra-Filho’s titis reflects seasonal arboreal resource availability

    • João Pedro Souza-Alves
    • Fabricio B. Baccaro
    • Adrian A. Barnett

    Original Article 29 August 2020 Pages: 199 - 206

    

22. The role of food transfers in wild golden lion tamarins (Leontopithecus rosalia): Support for the informational and nutritional hypothesis

    • Camille A. Troisi
    • William J. E. Hoppitt
    • Kevin N. Laland

    Original Article Open access 24 June 2020 Pages: 207 - 221

    

23. Intergroup food transfers in wild golden lion tamarins (Leontopithecus rosalia)

    • Camille A. Troisi

    Original Article Open access 07 August 2020 Pages: 223 - 231

    

24. Three decades of Philippine nonhuman primate studies: research gaps and opportunities for Philippine primatology

    • Lief Erikson Gamalo
    • Brian Sabanal
    • Andie Ang

    Original Article 17 July 2020 Pages: 233 - 239

    

25. Correction to: What is society?

    • Crickette Sanz

    Correction 21 December 2020 Pages: 241 - 241