2026

93. Escriche Chova, P., Bhattacharjee, D., Andres, T.J., Sterck, E.H.M., Schel, A.M., & Massen, J.J.M. (in press). Motherhood and sex predict emotional reactivity during a predator confrontation in two macaque species. American Journal of Primatology

92. Bhattacharjee, D., van Dijk, E.S.J., de Vries, R.E.M., Kluiver, C.E., Valomy, M., Zeeman, A.N., & Massen, J.J.M. (in press). Many facets of self-directed behaviour in macaques.  Royal Society Open Sciences

91. Bhattacharjee, D., Zijlstra, T.W., Roth, T.S., Belli, E., Calis, S., Escriche Chova, P., Cousin, E., de Jong, J.A., De Laat, E.J.A.M., Guðjónsdóttir, A.R., Janmaat, K.R.L., Jeunick, E.J., Kluiver, C., Kuijer, P., Middelburg, E., Pflüger, L.S., Schroderus, V., van Dijk, E. S. J., Verspeek, J., Waasdorp, S., Zeeman, A., Sterck, E.H.M., van Leeuwen, E.J.C. & Massen, J.J.M. (accepted). Despotism promotes cooperation through enhanced interdependencies in non-human primate societies. Nature Communications

90. Roth, T.S., Massen, J.J.M., & Samara, I. (in press). Inconsistent use of evolutionary frameworks in accounts of romantic relationships. Behavioral and Brain Sciences.

2025

89. De Laat, E.J.A.M., Waasdorp, S., Roth, T.S., Massen, J.J.M. ‡ & Sterck, E.H.M. ‡ (2025). Despotic long-tailed macaques benefit others in a group service paradigm. ‡ Shared senior authors. Behaviour, 162(15), 1079-1107. doi: 10.1163/1568539X-bja10338 

88. ManyBirds, Miller, R.,………Massen, J.J.M.,…et al. (2025). A large-scale study across the avian clade identifies ecological drivers of neophobia. PLoS Biology, 23(10), e3003394. doi: 10.1371/journal.pbio.3003394.

87. Brucks, D., Dam, N.C.P., Krasheninnikova, A., McGregor, B., Tsivlin, H., von Bayern, A.M.P., & Massen, J.J.M. (2025). Exploring the drivers of inter- and intraspecific differences in prosociality in four parrot species. Scientific Reports, 15, 23558. doi: 10.1038/s41598-025-04115-z.

86. de Groot, N.G., de Vos-Rouweler, A.J.M., Heijmans, C.M.C., Louwerse, A., Massen, J.J.M., Langermans, J., Bontrop, R.E., & Bruijnesteijn, J. (2025). Genetic conservation and population management of non-human primates: Parentage determination using seven microsatellite-based multiplexes. Ecology and Evolution, 15, e71216. doi: 10.1002/ece3.71216

85. Vanhooland, L-C., Mager, C., Teuben, A., Bugnyar, T. & Massen, J.J.M. (2025). Comparing the performances of chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla) in two self-awareness tasks. American Journal of Primatology, 87(3), e70010. doi: 10.1002/ajp.70010

84. Gill, T., Guatam, A., Massen, J.J.M. & Bhattacharjee, D., (2025). Personality assessment of synanthropic rhesus macaques: implications and challenges. American Journal of Primatology, 87(4), e70034. doi: 10.1002/ajp.70034

83. Massen, J.J.M., Boucherie, P., & Bugnyar, T. (2025). 3rd party interventions ravens. Animal Behaviour, 219, 123004. doi: 10.1016/j.anbehav.2024.10.018

82. Van Oosten, J.P., Vanhooland, L-C., Roth, T. S., Gallup, A.C., & Massen, J.J.M. (2025). No experimental evidence for yawn contagion in galah (Eulophus roseicapilla). Animal Behavior and Cognition, 12(2), 148-171. doi:  10.26451/abc.12.02.01.2025

81. De Moor, D., Skelton, M., MacaqueNet, ……Massen, J.J.M…….Duboscq, J., & Brent, L. J. N. (2025) MacaqueNet: big-team research into the biological drivers of social relationships. Journal of Animal Ecology, 94, 519–534. doi: 10.1111/1365-2656.14223

2024

80. Massen, J.J.M. (2024). Emoties en bewustzijn bij dieren (Emotions and conscience in animals). Journal of Humanistic studies, 98-99, 103-113. 

79. Perea-García, J.O., Massen, J.J.M., Ostner, J., Schulke, O., Castellano-Navarro, A., Gazagne, E., Domínguez, J.M.J., Beltrán-Francés, V., Kaburu, S., Ruppert, N., Micheletta, J., Gupta, S., Majolo, B., Marechal, L., Pflüger, L.S., Böhm, P.M., Bourjade, M, Duran, E., Hobaiter, C., & Monteiro, A. (2024). Photo-regulation is a stronger predictor of variation in external eye appearance than dominance style or tameness: evidence from a large sample of nine macaque species and an outgroup. Scientific Reports, 14, 29115. doi: 10.1038/s41598-024-80643-4

78. Sterck, E.H.M., Crockford, C., Fisher, J., Massen, J.J.M., Tiddi, B., Perry, S., Sueur, C., Schülke, O & Ostner, J. (2024). The evolution of between-sex bonds in primates. Evolution and Human Behavior, 24, 106628. doi: 10.1016/j.evolhumbehav.2024.106628

77. Horn, L., Juricka, N., Windhager, S., Bugnyar, T., Massen, J.J.M., & Markova, G. (2024). Investigating the effects of prenatal testosterone exposure (via 2D:4D) and socio-relational factors on 3-6-year-old preschoolers' prosocial choices. Early Human Development, 195, 106055. doi: 10.1016/j.earlhumdev.2024.106055 

76. Duran, E., Perea-García, J.O., Piepenbrock, D.M.J., Veefkind, C., Kret, M.E., & Massen, J.J.M. (2024). Preliminary evidence that eye appearance in parrots (Psittaciformes) co-varies with latitude and altitude. Scientific Reports, 14, 12859. doi: 10.1038/s41598-024-63599-3

75. Bhattacharjee, D., Waasdorp, S., Middelburg, E., Sterck, E.H.M., & Massen, J.J.M. (2024). Personality heterophily and friendship as drivers for successful cooperation. Proceedings of the Royal Society B., 291, 20232730. doi: 10.1098/rspb.2023.2730

74. Bhattacharjee, D., Guðjónsdóttir, A.R., Escriche Chova, P., Middelburg, E., Jäckels, J., de Groot, N., Wallner, B., Massen, J.J.M.‡, & Pflüger, L.S.‡ (2024). Behavioural, physiological and genetic drivers of coping. ‡Shared senior authors. iScience, 27(2), 108890. doi: 10.1016/j.isci.2024.108890

73. Horn, L., Bugnyar, T, & Massen, J.J.M. (2024). Testing the effects of kinship, reciprocity, and dominance on prosocial food provisioning in azure-winged magpies (Cyanopica cyana), carrion crows (Corvus corone), and common ravens (C. corax). Ethology, 130, e13420. doi: 10.1111/eth.13420

2023

72. Van Dijk, E. S. J.*, Bhattacharjee, D.*, Belli, E. & Massen, J.J.M. (2023). Hand preference predicts behavioural responses to threats in Barbary macaques. * co-first authors. American Journal of Primatology, 85, e23499. doi: 10.1002/ajp.23499

71. Bhattacharjee, D., Cousin, E., Pflüger, L.S. & Massen, J.J.M. (2023). Prosociality in a despotic society. iScience, 26, 106587. doi: 10.1016/j.isci. 2023.106587

70. Hammer, R., Stribos, M., Böhm, P.M., Pink, K.E., Wallner, B., Huffmann, M., Massen, J.J.M., & Pflüger, L.S. (2023). A novel methodological framework for group classification during group fission: a case of a semi-free ranging group of Japanese macaques (Macaca fuscata). American Journal of Primatology, 85, e23463. doi: 10.1002/ajp.23463  

69. Vanhooland, L-C., Szabo, A., Bugnyar, T. & Massen, J.J.M. (2023). A comparative approach of mirror self-recognition in three corvid species. Animal Cognition. 26, 229–248. doi: 10.1007/s10071-022-01696-4

2022

67. Kluiver, C.E., de Jong, J.A., Massen, J.J.M., & Bhattacharjee, D., (2022). Personality as a predictor of time-activity budget in lion-tailed macaques (Macaca silenus). Animals, 12, 1495. doi: 10.3390/ani12121495

66. Gallup, A.C., Schild, A.B., Ühlein, M.A. Bugnyar, T. & Massen, J.J.M. (2022). No evidence for contagious yawning in ravens (Corvus corax): an observational study. Animals, 12, 1357. doi: 10.3390/ani12111357 

65. Šlipogor, V., Graf, C., Massen, J.J.M., & Bugnyar, T. (2022). Personality and social environment predict cognitive performance in common marmosets (Callithrix jacchus). Scientific Reports, 12, 6702. doi: 10.1038/s41598-022-10296-8

64. Massen, J.J.M., & Gallup, A.C. (2022). The evidence does not support long-term oxygenation as a functional explanation for the evolution of yawning. Sleep and Breathing. doi: 10.1007/s11325-022-02627-w

63. Kret, M.E., Massen, J.J.M. & de Waal, F.B.M. (2022). My fear is not, and never will be, your fear: On emotions and feelings in animals. Affective science, 3, 182–189. doi: 10.1007/s42761-021-00099-x 

62. Boucherie, P., Gallego-Abenza, M., Massen, J.J.M. & Bugnyar, T. (2022). Dominance in a socially dynamic setting: how do ravens cope with changing group compositions and dependent ranks? Philosophical Transactions of the Royal Society B. 377, 20200446. doi: 10.1098/rstb.2020.0446 

61. Miller, R., Lambert, M.L., Frohnwieser, A., Brecht, K.F., Bugnyar, T., Crampton, I., Garcia-Pelegrin, E., Gould, K., Greggor, A., Izawa, E.-I., Kelly, D.M., Li, L., Lou, Y., Luong, L., Massen, J.J.M., Neider, A., Reber, S., Schiestl, M., Seguchi, A., Sepehri, P., Stevens, J.R., Taylor, A.H., Wang, L., Wolff, L.M., Zhang, Y., & Clayton, N.S. (2022). Individual consistency, species differences and the influence of socio-ecological factors on neophobia in 10 corvid species. Current Biology, 32, 74-85. doi: 10.1016/j.cub.2021.10.045

2021

60. Gallup, A.C., Kret, M.E., Eldakar, O.T., Folz, J., & Massen, J.J.M. (2021). People that score high on psychopathic traits are less likely to yawn contagiously. Scientific Reports, 11, 23779. doi: 10.1038/s41598-021-03159-1 

59. Laumer, I.B.*, Massen, J.J.M.*, Boehm, P.M., Boehm, A., Geisler, A. & Auersperg, A.M.I. (2021). Individual Goffin’s cockatoos (Cacatua goffiniana) show flexible targeted helping in a tool transfer task. PLoS One, 16, e0253416. doi: 10.1371/journal.pone.0253416   * co-first authors.

58. Stocker, M, Prösl, J., Vanhooland, L-C., Horn, L., Bugnyar, T., Canoine, V.# & Massen, J.J.M.# (2021). Measuring salivary mesotocin in birds - Seasonal differences in ravens’ peripheral mesotocin levels. # both authors contributed equally. Hormones & Behaviour, 134, 105015. doi: 10.1016/j.yhbeh.2021.105015  

57. Sigmundson, R., Stribos, M., Hammer, R., Herzele, J., Pflüger, L.S., & Massen, J.J.M. (2021). Exploring the cognitive capacities of Japanese macaques in a cooperation game. Animals, 11, 1497. doi: 10.3390/ ani11061497

56. Horn, L., Zewald, J.S., Bugnyar, T., & Massen, J.J.M. (2021). Carrion crows and azure-winged magpies show no prosocial tendencies when tested in a token exchange paradigm. Animals, 11, 1526. doi: 10.3390/ani11061526

55. Massen, J.J.M.*, Hartlieb, M.*, Martin, J.S.*, Leitgeb, E.B., Hockl, J., Kocourek, M., Olkowicz, S., Osadnik, C., Verkleij, J.W., Zhang, Y., Bugnyar, T., Nemec, P. & Gallup, A.C.  (2021). Brain size and neuron numbers drive differences in yawn duration across mammals and birds. Communications Biology, 4, 503. doi: 10.1038/s42003-021-02019-y *co-first authors.

54. Wijnen, M.N., Massen, J.J.M., & Kret, M.E. (in press). Gender bias in the allocation of student grants. Scientometrics

53. Šlipogor, V., Massen, J.J.M., Schiel, N., Souto, A., & Bugnyar, T. (2021). Temporal consistency and ecological validity of personality structure in common marmosets (Callithrix jacchus): a unifying field and laboratory approach. American Journal of Primatology, e23229. doi: 10.1002/ajp.23229

52. Martin, J.S., Koski, S.E., Bugnyar, T., Jaeggie, A.V. & Massen, J.J.M. (2021). Prosociality, social tolerance, and partner choice facilitate mutually beneficial cooperation in common marmosets. Animal Behaviour, 173, 115-136. doi: 10.1016/j.anbehav.2020.12.016

2020

50. Van Berlo, E., Díaz-Loyo, A.P., Juárez-Mora, O.E., Kret, M.E. & Massen, J.J.M. (2020). Experimental evidence for contagious yawning in Bornean orangutans (Pongo pygmeus). Scientific Reports, 10, 22251. doi: 10.1038/s41598-020-79160-x

49. Horn, L., Bugnyar T., Griesser, M., Hengl, M., Izawa, E.I., Oortwijn, T., Rössler, C., Scheer, C., Schiestl, M., Suyama, M., Taylor, A.H., Vanhooland, L.-C., von Bayern, A.M.P., Zürcher, Y. & Massen, J.J.M. (2020). Sex-specific effects of cooperative breeding and colonial nesting on prosociality in corvids. eLife, 9, e58139. doi: 10.7554/eLife.58139

48. Massen, J.J.M.*, Haley, S.M.* & Bugnyar, T. (2020). Azure-winged magpies’ decisions to share food are contingent on the presence or absence of food for the recipient. Scientific Reports, 10, 16147. doi: 10.1038/s41598-020-73256-0. *co-first authors

47.  Massen, J.J.M., Bauer, L., Spurny, B., Bugnyar, T. & Kret. M. E. (2020). Reply to: “The data do not support the existence of an ‘Old Boy network’ in science. Some critical comments on a study by Massen et al.” Scientific Reports, 10, 13783. doi: 10.1038/s41598-020-69108-6

46. Stocker, M, Loretto, M.C., Sterck, E.H.M., Bugnyar, T. & Massen, J.J.M. (2020). Cooperation with closely bonded individuals reduces cortisol levels in long-tailed macaques. Royal Society Open Science, 7, 191056. doi:10.1098/rsos.191056

45. Gallup, A.G. & Massen, J.J.M. (2020). Intranasal oxytocin, empathy, and contagious yawning in dogs and humans. Applied Animal Behaviour Science, 224, 104971. doi:  10.1016/j.applanim.2020.104971

44. Massen, J.J.M. (2020). Editorial: Studying the evolution of cooperation and prosociality in birds (editorial). Ethology, 126, 121-124. doi: 10.1111/eth.13001.

43. Morales Picard, A., Mundry, R., Auersperg, A.M., Boeving, E.R., Boucherie, P.M., Bugnyar, T, Dufour, V., Emery, N.J., Federspiel, I., Gajdon, G., Guéry, J.-P., Hegedic, M., Horn, L., Kavanagh, E., Lambert, M.L., Massen, J.J.M., Rodrigues, M., Schiestl, M., Schwing, R., Szabo, B., Taylor, A.H., van Horik, J.O., von Bayern, A.M.P., Seed, A, & Slocombe, K.E. (2020). Why preen others? Predictors of allopreening in parrots and corvids and comparisons to grooming in great apes. Ethology, 126, 207-228. doi: 10.1111/eth.12999.

42. Gallup, A. C., Moscatello, L. & Massen, J.J.M. (2020). Yawn duration predicts brain weight across domesticated dog breeds. Current Zoology.

41. Sierro, J., Loretto, M.C., Szipl, G., Massen, J.J.M. & Bugnyar, T. (2020). Food calling in ravens (Corvus corax) revisited: who is addressed? Ethology, 126, 257-266. doi: 10.1111/eth.12991.

40. Vanhooland, L.-C., Bugnyar, T. & Massen, J.J.M. (2020). Crows (Corvus corone sp.) check the contingency of their behaviour in a mirror, yet fail to pass the Mirror-Mark Test. Journal of Comparative Psychology, 134, 158-169. doi: 10.1037/com0000195.

39. Laumer, I.B*, Massen, J.J.M.*, Lorck-Tympner, M., Wakonig, B., Carminito, C. & Auersperg, A.M.I. (2020). Tentative evidence for inequity aversion to unequal work-effort but not to unequal reward distribution in Goffin’e cockatoos. Ethology, 126, 185-194. doi: 10.1111/eth.12947. * co-first authors.

2019

38. Massen, J.J.M., Behrens, F., Martin, J.S., Stocker, M. & Brosnan, S.F. (2019). A comparative approach to affect and cooperative decision-making. Neuroscience & Biobehavioural Reviews, 107, 370-387. 

37. Bouchery, P., Loretto, M.C., Massen, J.J.M., & Bugnyar, T.,  (2019). What constitutes ‘social complexity’ and ‘social intelligence’ in birds? Lessons from ravens. Behavioral Ecology and Sociobiology, 73, 12. doi: 10.1007/s00265-018-2607-2

36. Martin, J.S., Massen, J.J.M., Šlipogor, V., Bugnyar, T., Jaeggie, A.V. & Koski, S.E. (2019). The EGA+GNM Framework: An Integrative Approach to Modeling Behavioral Syndromes. Methods in Ecology and Evolution. doi: 10.1111/2041-210X.13100

2018

35. Horn, L., Hungerländer, N.A., Windhager, S., Bugnyar, T. & Massen, J.J.M. (2018). Social status and prenatal testosterone exposure affect 6–9-year-old children’s prosocial choices. Scientific Reports, 8, 9198. doi: 10.1038/s41598-018-27468-0

2017

34. Massen, J.J.M., Bauer, L., Spurny, B., Bugnyar, T. & Kret. M. E. (2017). Sharing of science is most likely among male scientists. Scientific Reports, 7, 12927. doi: 10.1038/s41598-017-13491-0

33. Massen, J.J.M. & Gallup, A.C. (2017). Why contagious yawning does not (yet) equate to empathy. Neuroscience & Biobehavioral Reviews, 80, 573-585. doi: 10.1016/j.neubiorev.2017.07.006.

32. Müller, J.J.A.*, Massen, J.J.M.*, Bugnyar, T. & Osvath, M. (2017). Ravens remember the nature of a single reciprocal interaction sequence over two days and even after a month. Animal Behaviour, 128, 69-78. doi:10.1016/j.anbehav.2017.04.004.

*Co-first authors

31. Munteanu, A.M., Stocker, M., Stöwe, M., Massen, J.J.M. & Bugnyar, T. (2017). Behavioural and hormonal stress responses to social separation in ravens, Corvus corax. Ethology, 123, 123-135. doi: 10.1111/eth.12580

30. Lambert, M.L., Massen, J.J.M., Seed, A.M., Bugnyar, T. & Slocombe, K.E. (2017). An ‘unkindness’ of ravens? Measuring prosocial preferences in Corvus corax. Animal Behaviour, 123, 383-393. doi: 10.1016/j.anbehav.2016.11.018

2016

29. Horn, L., Scheer, C., Bugnyar, T. & Massen, J.J.M. (2016). Proactive prosociality in a cooperative breeding corvid, the Azure winged magpie (Cyanopica cyanus). Biology Letters, 12, 20160649. doi: 10.1098/rsbl.2016.0649

28. Schwing, R., Jocteur, E., Wein, A., Noë, R. & Massen, J.J.M. (2016). Kea cooperate better with sharing affiliates. Animal Cognition, 19, 1093–1102. doi: 10.1007/s10071-016-1017-y

27.  Gallup, A.C. & Massen, J.J.M.# (2016). There is no difference in contagious yawning between men and women. Royal Society Open Science, 3, 160174. doi: 10.1098/rsos.160174. # both authors contributed equally

26. Massen, J.J.M., Šlipogor, V. & Gallup, A.C. (2016). An investigation of behavioural contagion in common marmosets (Callithrix jacchus): an observational study. Frontiers in Comparative Psychology. 7, 1190. doi: 10.3389/fpsyg.2016.01190

25. Šlipogor, V., Gunhold-de Oliveira, T., Tadic, Z., Massen, J.J.M. & Bugnyar, T. (2016). Consistent inter-individual differences in marmosets (Callitrix jachus) in Boldness-Shyness, Stress-Activity and Exploration-Avoidance. American Journal of Primatology. 78, 961–973. doi: 10.1002/ajp.22566

24. Asakawa-Haas, K., Schiestl, M., Bugnyar, T. & Massen, J.J.M. (2016). Partner choice in raven (Corvus corax) cooperation. PLoS ONE, 11, e0156962. doi: 10.1371/journal.pone.0156962

2015

23. Kalcher-Sommersguter, E., Preuschoft, S., Franz-Schaider, C., Hemelrijk, C.K., Crailsheim, K. & Massen, J.J.M. (2015). Early maternal loss affects social integration of chimpanzees throughout their lifetime. Scientific Reports, 5, 16439. doi: 10.1038/srep16439

22. Massen, J.J.M., Church, A. & Gallup, A.C. (2015). Auditory contagious yawning in humans: an investigation into affiliation and status effects. Frontiers in Psychology, 6, 1735. doi: 10.3389/fpsyg.2015.01735

21. Massen, J.J.M., Ritter, C. & Bugnyar, T. (2015). Tolerance and reward equity predict cooperation in ravens (Corvus corax). Scientific Reports, 5, 15021. doi: 10.1038/srep15021

20. Sonnweber, R.S., Massen, J.J.M. & Fitch, W.T. (2015). Post-copulatory grooming: a conditional mating strategy? Behavioural Ecology and Sociobiology, 69, 1749–1759. doi: 10.1007/s00265-015-1987-9

19. Massen, J.J.M., Lambert, M., Schiestl, M. & Bugnyar, T. (2015). Subadult ravens generally don't transfer valuable tokens to conspecifics when there is nothing to gain for themselves. Frontiers in Comparative Psychology, 6, 885. doi: 10.3389/fpsyg.2015.00885

18. Sterck, E.H.M., Olesen, C.U. & Massen, J.J.M. (2015). No costly pro-sociality among related long-tailed macaques, Macaca fascicularis. Journal of Comparative Psychology, 129, 275-282. doi: 10.1037/a0039180

2014

17.  Massen, J.J.M., Szipl, G., Spreafico, M. & Bugnyar, T. (2014). Ravens intervene in others’ bonding attempts. Current Biology, 24, 2733-2736. doi: 10.1016/j.cub.2014.09.073

16.  Massen, J.J.M., Dusch, K., Eldakar, O.T. & Gallup, A.C. (2014). A thermal window for yawning in humans: Yawning as a Brain Cooling Mechanism. Physiology & Behavior, 130: 145-148. doi: 10.1016/j.physbeh.2014.03.032

15.  Massen, J.J.M., Pašukonis, A., Schmidt, J. & Bugnyar, T. (2014). Ravens notice dominance reversals among conspecifics within and outside their social group. Nature Communications, 5: 3679. doi: 10.1038/ncomms4679

14.  Gunhold, T., Massen, J.J.M., Schiel, N., Souto, A. & Bugnyar, T. (2014). Memory, transmission and persistence of alternative foraging techniques in wild common marmosets. Animal Behaviour, 91: 79-91. doi: 10.1016/j.anbehav.2014.02.023

13.  Massen, J.J.M. & Koski, S.E. (2014). Chimps of a feather sit together. Chimpanzee friendships are based on homophily in personality. Evolution and Human Behavior, 35: 1-8. doi: 10.1016/j.evolhumbehav.2013.08.008

2013

12. Massen, J.J.M. & Sterck, E.H.M. (2013). Stability and durability of within- and between-sex social bonds of captive rhesus macaques (Macaca mulatta). International Journal of Primatology, 34: 770-791. doi: 10.1007/s10764-013-9695-7

11. Massen, J.J.M., Antonides, A., Arnold, A. K., Bionda, T. & Koski, S.E. (2013). A behavioral view on chimpanzee personality: exploration tendency, persistence, boldness and tool-orientation measured with group experiments. American Journal of Primatology, 75: 947-958. doi: 10.1002/ajp.22159

2012

10. Massen, J.J.M., Vermunt, D.A. & Sterck, E.H.M. (2012). Male yawning is more contagious than female yawning among chimpanzees (Pan troglodytes). PLoS ONE, 7(7): e40697. doi:10.1371/journal.pone.0040697

09. Overduin-de Vries, A.M., Massen, J.J.M., Spruijt, B.M. & Sterck, E.H.M. (2012). Sneaky monkeys: an audience effect on rhesus macaque (Macaca mulatta) sexual behaviour. American Journal of Primatology, 74: 217–228. doi: 10.1002/ajp.21988

08. Massen, J.J.M., van den Berg, L.M., Spruijt, B.M. & Sterck, E.H.M. (2012). Inequity aversion and the effect of relationship quality in long-tailed macaques (Macaca fascicularis). American Journal of Primatology, 74: 145-156. doi: 10.1002/ajp.21014

07. Massen, J.J.M., Overduin-de Vries, A.M., de Vos-Rouweler, A.J.M., Spruijt, B.M., Doxiadis, G.G.M. & Sterck, E.H.M. (2012). Male mating tactics in captive rhesus macaques, Macaca mulatta: the influence of dominance, markets and relationship quality. International Journal of Primatology. 33: 73-92. doi: 10.1007/s10764-011-9552-5

2011

06. Massen, J.J.M., Luyten, I.J.A.F., Spruijt, B.M. & Sterck, E.H.M. (2011). Benefiting friends or dominants: Pro-social choices mainly depend on rank position in long-tailed macaques (Macaca fascicularis). Primates, 52: 237-247. doi: 10.1007/s10329-011-0244-8

2010

05. Massen, J.J.M., van den Berg, L.M., Spruijt, B.M. & Sterck, E.H.M. (2010). Generous leaders and selfish underdogs: Pro-sociality in despotic macaques. PLoS ONE 5(3): e9734. doi: 10.1371/journal.pone.0009734

04.  Massen, J.J.M., Sterck, E.H.M. & de Vos, H. (2010). A review of close social associations in animals and humans: Functions and mechanisms of friendship. Behaviour, 147: 1379-1412. doi: 10.1163/000579510X528224

Book chapters:

03. Massen, J.J.M., Schaake, W.A.A. & Bugnyar, T. (in pres). A comparison of cooperative cognition in corvids, chimpanzees, and other animals. In: (L. Hopper & S. Ross eds.) Chimpanzees in context. Chicago, USA: University of Chicago Press.

02. Massen, J.J.M. (2017). Friendship in animals. In: (J. Vonk & T.K. Shackelford eds.) Encyclopedia of Animal Cognition and Behavior. New York, USA: Springer Nature.

01. Bugnyar, T. & Massen, J.J.M. (2017) Avian social relations, social cognition & cooperation. In: Healy, S & ten Cate, C.J. (Eds.), Avian Cognition (pp. 314-336). Cambridge, UK: Cambridge University Press.