A first report of separation calls in southern yellow-cheeked gibbons (Nomascus gabriellae) in captivity Michal HradecGudrun IllmannPetra Bolechová News and Perspectives 24 October 2020 Pages: 5 - 10
Mixed-species associations and attempted mating suggest hybridization between purple-faced and tufted gray langurs of Sri Lanka Amy LuDon Geethal Ramyanath SirimannaRoberta Salmi News and Perspectives 17 August 2020 Pages: 11 - 17
Age and sex differences in juvenile bonobos in party associations with their mothers at Wamba Kazuya TodaHeungjin RyuTakeshi Furuichi Original Article 12 August 2020 Pages: 19 - 27
Object sorting into a two-dimensional array in humans and chimpanzees Misato HayashiHideko Takeshita Original Article 29 July 2020 Pages: 29 - 39
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-GrovesMaryos V. TandangJamartin Sihite Original Article 04 July 2020 Pages: 41 - 49
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. HawkinsJason D. StruthersGary West Original Article 12 September 2020 Pages: 51 - 61
Sleeping trees and sleep-related behaviours of the siamang (Symphalangus syndactylus) in a tropical lowland rainforest, Sumatra, Indonesia Nathan J. HarrisonRoss A. HillAmanda H. Korstjens Original Article Open access 27 July 2020 Pages: 63 - 75
White-handed gibbons (Hylobates lar) alter ranging patterns in response to habitat type Lydia E. O. LightTommaso SaviniThad Q. Bartlett Original Article 03 September 2020 Pages: 77 - 90
Male–male social bonds predict tolerance but not coalition formation in wild Japanese macaques Tatsuro Kawazoe Original Article 22 June 2020 Pages: 91 - 101
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 OiShin-ichiro HamasakiYoshi Kawamoto Original Article 02 July 2020 Pages: 103 - 112
Molecular histology of spermatogenesis in the Japanese macaque monkey (Macaca fuscata) Sawako OkadaKota KurokiMasanori Imamura Original Article 17 August 2020 Pages: 113 - 121
Behavioral mimicry predicts social favor in adolescent rhesus macaques (Macaca mulatta) Jordan A. AndersonErin L. Kinnally Original Article 19 September 2020 Pages: 123 - 131
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. PebsworthThibaud GruberSera L. Young Original Article 16 July 2020 Pages: 133 - 142
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 JumailLiew Thor-SengDanica J. Stark Original Article 22 June 2020 Pages: 143 - 151
The Lisu people’s traditional natural philosophy and its potential impact on conservation planning in the Laojun Mountain region, Yunnan Province, China Jie LiuDejing LiSatoshi Hirata Original Article 27 July 2020 Pages: 153 - 164
Fruit availability has a complex relationship with fission–fusion dynamics in spider monkeys Kayla S. HartwellHugh NotmanMary M. S. M. Pavelka Original Article 10 September 2020 Pages: 165 - 175
Molecular phylogenetic inference of the howler monkey radiation (Primates: Alouatta) Esmeralda D. DoyleIvan PratesEugene E. Harris Original Article 02 September 2020 Pages: 177 - 188
A high-diversity primate community in a mid-elevation flooded forest, the Jungla de Los Monos Community Reserve, Peru Sam ShaneeNestor AllgasNoga Shanee Original Article 10 June 2020 Pages: 189 - 197
For emergency only: terrestrial feeding in Coimbra-Filho’s titis reflects seasonal arboreal resource availability João Pedro Souza-AlvesFabricio B. BaccaroAdrian A. Barnett Original Article 29 August 2020 Pages: 199 - 206
The role of food transfers in wild golden lion tamarins (Leontopithecus rosalia): Support for the informational and nutritional hypothesis Camille A. TroisiWilliam J. E. HoppittKevin N. Laland Original Article Open access 24 June 2020 Pages: 207 - 221
Intergroup food transfers in wild golden lion tamarins (Leontopithecus rosalia) Camille A. Troisi Original Article Open access 07 August 2020 Pages: 223 - 231
Three decades of Philippine nonhuman primate studies: research gaps and opportunities for Philippine primatology Lief Erikson GamaloBrian SabanalAndie Ang Original Article 17 July 2020 Pages: 233 - 239