Girard-Buttoz C, Heistermann M, Rahmi E, Agil M, Ahmad Fauzan P, Engelhardt A. 2015. Androgen correlates of male reproductive effort in wild male long-tailed macaques (Macaca fascicularis): A multi-level test of the challenge hypothesis. Physiology & behavior, 141 :143-153 >DOI

Adams MJ, Majolo B, Ostner J, Schülke O, De Marco A, Thierry B, Engelhardt A, Widdig A, Gerald MS, Weiss A. 2015. Personality structure and social style in macaques. Journal of personality and social psychology, 109 :338-353 >DOI

Micheletta J, Whitehouse J, Parr LA, Marshman P, Engelhardt A, Waller BM. 2015. Familiar and unfamiliar face recognition in crested macaques (Macaca nigra). Royal Society open science, 2 :150109 >DOI

Marty PR, Hodges K, Agil M, Engelhardt A. 2015. Alpha male replacements and delayed dispersal in crested macaques (Macaca nigra). American journal of primatology,

Higham JP, Kraus C, Stahl-Hennig C, Engelhardt A, Fuchs D, Heistermann M. 2015. Evaluating noninvasive markers of nonhuman primate immune activation and inflammation. American journal of physical anthropology, 158 :673-684 >DOI

Danish LM, Heistermann M, Agil M, Engelhardt A. 2015. Validation of a Novel Collection Device for Non-Invasive Urine Sampling from Free-Ranging Animals. PloS one, 10 :e0142051 >DOI

Duboscq J, Agil M, Engelhardt A, Thierry B. 2014. The function of postconflict interactions: new prospects from the study of a tolerant species of primate Animal Behaviour, 87 :107-120 >DOI

Girard-Buttoz C, Heistermann M, Rahmi E, Marzec A, Agil M, Fauzan PA, Engelhardt A. 2014. Mate-guarding constrains feeding activity but not energetic status of wild male long-tailed macaques (Macaca fascicularis). Behavioral ecology and sociobiology, 68 :583-595 >DOI

Girard-Buttoz C, Heistermann M, Rahmi E, Agil M, Fauzan PA, Engelhardt A. 2014. Costs of and Investment in Mate-Guarding in Wild Long-Tailed Macaques (Macaca fascicularis): Influences of Female Characteristics and Male-Female Social Bonds. International journal of primatology, 35 :701-724 >DOI

Kerhoas D, Perwitasari-Farajallah D, Agil M, Widdig A, Engelhardt A. 2014. Social and ecological factors influencing offspring survival in wild macaques. Behavioral ecology : official journal of the International Society for Behavioral Ecology, 25 :1164-1172 >DOI

Girard-Buttoz C, Heistermann M, Rahmi E, Agil M, Fauzan PA, Engelhardt A. 2014. Costs of mate-guarding in wild male long-tailed macaques (Macaca fascicularis): physiological stress and aggression. Hormones and behavior, 66 :637-648 >DOI

Engelhardt A, Zinner D, Fickenscher GH, Roos C, Anandam MV, Bennett EL, Davenport TRB, Davies NJ, Detwiler KM, Eudey AA, Gadsby EL, Groves CP, Healy A, Karanth KP, Molur S, Nadler T, Richardson MC, Riley EP, Rylands AB, Sheeran LK, Ting N, Wallis J, Waters S, Whittaker DJ. 2013. Family Cercopithecidae (Old World Monkeys) Mittermeier RA, Rylands AB, Wilson DE. Handbook of the Mammals of the World Primates 3 Lynx Edicions 9788496553897

MICHELETTA J, ENGELHARDT ANTJE, MATTHEWS LEE, AGIL MUHAMMAD, WALLER BRIDGETM. 2013. Multicomponent and Multimodal Lipsmacking in Crested Macaques () Higham JP, Semple S. American Journal of Primatology, 75 :763-773 >DOI

Duboscq J, Micheletta J, Agil M, Hodges K, Thierry B, Engelhardt A. 2013. Social tolerance in wild female crested macaques (Macaca nigra) in Tangkoko-Batuangus Nature Reserve, Sulawesi, Indonesia. American journal of primatology, 75 :361-375 >DOI

Neumann C, Agil M, Widdig A, Engelhardt A. 2013. Personality of wild male crested macaques (Macaca nigra). PloS one, 8 :e69383 >DOI

Engelhardt A, Fischer J, Neumann C, Pfeifer J-B, Heistermann M. 2012. Information content of female copulation calls in wild long-tailed macaques (Macaca fascicularis) Behavioral Ecology and Sociobiology, 66 :121-134 >DOI

Micheletta J, Waller BM, Panggur MR, Neumann C, Duboscq J, Agil M, Engelhardt A. 2012. Social bonds affect anti-predator behaviour in a tolerant species of macaque, Macaca nigra Proceedings of the Royal Society B: Biological Sciences, 279 :4042-4050 >DOI

Palacios JFG, Engelhardt A, Agil M, Hodges K, Bogia R, Waltert M. 2012. Status of, and conservation recommendations for, the Critically Endangered crested black macaque Macaca nigra in Tangkoko, Indonesia Oryx, 46 :290-297 >DOI

Dubuc C, Muniz L, Heistermann M, Widdig A, Engelhardt A. 2012. Do males time their mate-guarding effort with the fertile phase in order to secure fertilisation in Cayo Santiago rhesus macaques? Hormones and behavior, 61 :696-705 >DOI

Higham JP, Heistermann M, Saggau C, Agil M, Perwitasari-Farajallah D, Engelhardt A. 2012. Sexual signalling in female crested macaques and the evolution of primate fertility signals. BMC evolutionary biology, 12 :89 >DOI

Dubuc C, Muniz L, Heistermann M, Engelhardt A, Widdig A. 2011. Testing the priority-of-access model in a seasonally breeding primate species Behavioral Ecology and Sociobiology, 65 :1615-1627 >DOI

Neumann C, Duboscq J, Dubuc C, Ginting A, Irwan AM, Agil M, Widdig A, Engelhardt A. 2011. Assessing dominance hierarchies: validation and advantages of progressive evaluation with Elo-rating Animal Behaviour, 82 :911-921 >DOI

Girard-Buttoz C, Higham JP, Heistermann M, Wedegärtner S, Maestripieri D, Engelhardt A. 2011. Urinary C-peptide measurement as a marker of nutritional status in macaques. PloS one, 6 :e18042 >DOI

Higham JP, Hughes KD, Brent LJ, Dubuc C, Engelhardt A, Heistermann M, Maestriperi D, Santos LR, Stevens M. 2011. Familiarity affects the assessment of female facial signals of fertility by free-ranging male rhesus macaques. Proceedings. Biological sciences / The Royal Society, 278 :3452-3458 >DOI

Higham JP, Girard-Buttoz C, Engelhardt A, Heistermann M. 2011. Urinary C-peptide of insulin as a non-invasive marker of nutritional status: some practicalities. PloS one, 6 :e22398 >DOI

Neumann C, Assahad G, Hammerschmidt K, Perwitasari-Farajallah D, Engelhardt A. 2010. Loud calls in male crested macaques, Macaca nigra: a signal of dominance in a tolerant species Animal Behaviour, 79 :187-193 >DOI

Higham JP, Brent LJ, Dubuc C, Accamando AK, Engelhardt A, Gerald MS, Heistermann M, Stevens M. 2010. Color signal information content and the eye of the beholder: a case study in the rhesus macaque. Behavioral ecology : official journal of the International Society for Behavioral Ecology, 21 :739-746 >DOI

Dubuc C, Brent LJN, Accamando AK, Gerald MS, MacLarnon A, Semple S, Heistermann M, Engelhardt A. 2009. Sexual Skin Color Contains Information About the Timing of the Fertile Phase in Free-ranging Macaca mulatta International Journal of Primatology, 30 :777-789 >DOI

Girard-Buttoz C, Heistermann M, Krummel S, Engelhardt A. 2009. Seasonal and social influences on fecal androgen and glucocorticoid excretion in wild male long-tailed macaques (Macaca fascicularis). Physiology & behavior, 98 :168-175 >DOI

Brauch K, Hodges K, Engelhardt A, Fuhrmann K, Shaw E, Heistermann M. 2008. Sex-specific reproductive behaviours and paternity in free-ranging Barbary macaques (Macaca sylvanus) Behavioral Ecology and Sociobiology, 62 :1453-1466 >DOI

Duboscq J, Neumann C, Perwitasari-Farajallah D, Engelhardt A. 2008. Daytime birth of a baby crested black macaque (Macaca nigra) in the wild BEHAVIOURAL PROCESSES, 79 :81-84 >DOI >Link

Engelhardt A, Hodges JK, Heistermann M. 2007. Post-conception mating in wild long-tailed macaques (Macaca fascicularis): characterization, endocrine correlates and functional significance. Hormones and behavior, 51 :3-10 >DOI

Engelhardt A, Heistermann M, Hodges JK, Nürnberg P, Niemitz C. 2006. Determinants of male reproductive success in wild long-tailed macaques (Macaca fascicularis)—male monopolisation, female mate choice or post-copulatory mechanisms? Behavioral Ecology and Sociobiology, 59 :740-752 >DOI

Pradhan GR, Engelhardt A, van Schaik CP, Maestripieri D. 2006. The evolution of female copulation calls in primates: a review and a new model Behavioral Ecology and Sociobiology, 59 :333-343 >DOI

Engelhardt A, Hodges JK, Niemitz C, Heistermann M. 2005. Female sexual behavior, but not sex skin swelling, reliably indicates the timing of the fertile phase in wild long-tailed macaques (Macaca fascicularis). Hormones and behavior, 47 :195-204 >DOI

Engelhardt A. 2004. The Significance of Male and Female Reproductive Strategies for Male Reproductive Success in Wild Longtailed Macaques (Macaca Fascicularis) Cuvillier Verlag 9783865371706

Engelhardt A, Pfeifer J-B, Heistermann M, Niemitz C, van Hooff JARAM, Hodges JK. 2004. Assessment of female reproductive status by male longtailed macaques, Macaca fascicularis, under natural conditions Animal Behaviour, 67 :915-924 >DOI