Ordered by Subject

Prosociality

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. (2026). Despotism promotes dyadic cooperation through enhanced interdependencies in non-human primate societies. Nature Communications, 17, 3513 (pdf)

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 (pdf)

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. (pdf)

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 (pdf)

Horn, L., Bugnyar, T, & Massen, J.J.M. (2023). 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, 00, 1-14. doi: 10.1111/eth.13420 (pdf)

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 (pdf)

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. * co-first authors. (pdf)

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. (pdf)

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. (pdf)

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. (pdf)

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. *co-first authors (pdf)

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. (pdf)

Massen, J.J.M. (2020). Editorial: Studying the evolution of cooperation and prosociality in birds. Ethology, 126, 121-124. (pdf)

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. (pdf)

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. (pdf)

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. (pdf)

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 (pdf)

Massen, J.J.M., Lambert, M., Schiestl, M. & Bugnyar, T. (2015). Ravens can, but mostly don’t help conspecifics to gain access to food when there is nothing to gain for themselves. Frontiers in Comparative Psychology, 6, 885. doi:10.3389/fpsyg.2015.00885 (pdf)

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 (pdf)

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

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 (pdf)

Cooperation

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 (pdf)

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. (pdf)

Massen, J.J.M., Schaake, W.A.A. & Bugnyar, T. (2020). 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 (pp. 368-390).

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. (pdf)

Massen, J.J.M. (2020). Editorial: Studying the evolution of cooperation and prosociality in birds. Ethology, 126, 121-124. (pdf)

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 * co-first authors. (pdf)

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. (pdf)

Müller, J.J.A., Massen, J.J.M., Bugnyar, T. & Osvath, M. (2017). Ravens remember the nature of a single reciprocal interaction sequence over 2 days and even after a month. Animal Behaviour, 128, 69-78. (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

Animal Social Bonds

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. doi: 10.1111/1365-2656.14223 (pdf)

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 (pdf)

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 (pdf)

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., Hegedič, 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. (pdf)

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. (pdf)

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. (pdf)

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

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 (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

Massen, J.J.M. (2010). ‘Friendship’ in Macaques. Economics and Emotions. Utrecht University. ISBN: 978-90-393-5325-7. (pdf)

Yawning and other Contagious Behaviors

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 (pdf)

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 (pdf)

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 (pdf)

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. (pdf)

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., Němec, P. & Gallup, A.C. (2021). Brain size and neuron numbers drive differences in yawn duration across mammals and birds. Communications Biology, 4, 503. *co-first authors (pdf)

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. (pdf)

Gallup, A.G. & Massen, J.J.M. (2020). Intranasal oxytocin, empathy, and contagious yawning in dogs and humans. Applied Animal Behaviour Science, 224, 104971. (pdf)

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

Massen, J.J.M. & Gallup, A.C. (2017). Why contagious yawning does not (yet) equate to empathy. Neuroscience & Biobehavioral Reviews, 80, 573-585. (pdf)

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 (pdf)

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 (pdf)

Massen, J.J.M., Church, A. & Gallup, A.C. (2015). The influence of political affiliation and status on auditory contagious yawning in humans. Frontiers in Psychology, 6, 1735. doi: 10.3389/fpsyg.2015.01735 (pdf)

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 (pdf)

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 (pdf)

Personality

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 (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

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. (pdf)

Martin, J.S., Massen, J.J.M., Šlipogor, V., Bugnyar, T., Jaeggie, A.V. & Koski, S.E. (2018). The EGA+GNM Framework: An Integrative Approach to Modeling Behavioral Syndromes. Methods in Ecology and Evolution. (pdf)

Šlipogor, V., Gunhold-de Oliveira, T., Tadić, 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 (pdf)

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 (pdf)

Animal Emotion

Escriche Chova, P., Bhattacharjee, D., Andres, T.J., Sterck, E.H.M., Schel, A.M., & Massen, J.J.M. (2026). Motherhood and sex predict emotional reactivity during a predator confrontation in two macaque species. American Journal of Primatology, 88, e70143 (pdf)

Bhattacharjee, D., van Dijk, E.S.J., de Vries, R.E.M., Kluiver, C.E., Valomy, M., Zeeman, A.N., & Massen, J.J.M. (2026). Many facets of self-directed behaviour in macaques. Royal Society Open Sciences, 13, 252422. https://doi.org/10.1098/rsos.252422 (pdf)

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 (pdf)

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. Hormones & Behaviour, 134, 105015. (pdf)

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. (pdf)

Mating Strategies

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 (pdf)

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 (pdf)

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 (pdf)

3rd-party Understanding

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 (pdf)

Massen, J.J.M. & Mielke, A. (2021). Third-party interactions. In: (J. Vonk & T.K. Shackelford eds.) Encyclopedia of Animal Cognition and Behavior. New York, USA: Springer Nature. (pdf)

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.2014.09.0731(pdf)

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 (pdf)

Animal Self-Awareness

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). doi: 10.1002/ajp.70010 (pdf)

Vanhooland, L-C., Szabo, A., Bugnyar, T. & Massen, J.J.M. (2022). A comparative approach of mirror self-recogntion in three corvid species. Animal Cognition. doi: 10.1007/s10071-022-01696-4 (pdf)

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 (pdf)

Misc.

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 (pdf)

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. (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

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 (pdf)

Wijnen, M.N., Massen, J.J.M., & Kret, M.E. (2021). Gender bias in the allocation of student grants. Scientometrics. (pdf)

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. (pdf)

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 (pdf)

Jorg J. M. Massen, PhD

Publications