The Different Physical and Behavioural Characteristics of Zoo Mammals That Influence Their Response to Visitors
Open accessAbstract
The factors underlying the ‘zoo visit effect’ (changes in animal behaviour/physiology in response to visitor presence) are still poorly understood, despite it being widely investigated. The present study examined the effect of zoo visitors on the behaviour of 17 different species of mammals at the Belo Horizonte Zoo, Minas Gerais, Brazil. The behaviour of the animals was recorded using scan (focal in one case) sampling with instantaneous recording of behaviour, during 12 continuous months. Data were analysed using a comparative method examining five different factors: diet, body weight, stratum occupied, activity cycle, and habitat, as well as three different visitor categories: small and quiet audience, medium size audience and medium noise, and large size and loud audience. Significant changes in the behaviour for each factor, especially increases in locomotor and resting behaviour, were observed in response to different visitor categories. The factors that most explained responses to visitor categories were habitat and activity cycle. Species from closed habitats compared to open habitats were significantly more impacted (more behaviour affected), probably, because they are, evolutionarily, less accustomed to visual contact with people. Diurnal species showed more behavioural changes than nocturnal ones, possibly, because they were being observed during their normal activity cycle. These results may help zoos identify which mammal species are most susceptible to the zoo visitor effect, and consequently, be more pro-active in the use of mitigating strategies.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Significant differences were found in locomotor and resting behaviour in different species in response to different visitor categories of small, medium and large crowd sizes and noise levels.
“The authors found significant differences in locomotor and resting behaviour in different species in response to different visitor categories of small, medium and large crowd sizes and noise levels.”
From The visitor effect on zoo animals: implications and opportunities for zoo animal welfare (2019) · cites this paper as [80]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
Hormones as indicators of stress
Möstl, E., & Palme, R. (2002) · Domestic Animal Endocrinology · doi:10.1016/s0739-7240(02)00146-7 · Cited by 1,166 · see citing works
Measuring Fecal Glucocorticoid Metabolites in Mammals and Birds: The Importance of Validation
TOUMA, C., & PALME, R. (2005) · Annals of the New York Academy of Sciences · doi:10.1196/annals.1343.006 · Cited by 844 · see citing works
Effects of Subsistence Hunting on Vertebrate Community Structure in Amazonian Forests
Peres, C. A. (2000) · Conservation Biology · doi:10.1046/j.1523-1739.2000.98485.x · Cited by 660 · see citing works
Captivity effects on wide-ranging carnivores
Clubb, R., & Mason, G. (2003) · Nature · doi:10.1038/425473a · Cited by 430 · see citing works
Ethogram and Ethnography of Mahale Chimpanzees.
Nishida, T., Kano, T., Goodall, J. R., McGrew, W. C., & Nakamura, M. (1999) · Anthropological Science · doi:10.1537/ase.107.141 · Cited by 256 · see citing works
Zoo animals and their human audiences: what is the visitor effect?
Hosey, G. R. (2000) · Animal Welfare · doi:10.1017/s0962728600022946 · Cited by 249 · see citing works
The global reach of zoos and aquariums in visitor numbers and conservation expenditures
Gusset, M., & Dick, G. (2010) · Zoo Biology · doi:10.1002/zoo.20369 · Cited by 234 · see citing works
Visitors excite primates in zoos
Chamove, A. S., Hosey, G. R., & Schaetzel, P. (1988) · Zoo Biology · doi:10.1002/zoo.1430070407 · Cited by 230 · see citing works
Visitors’ effects on the welfare of animals in the zoo: a review
Davey, G. (2007) · Journal of Applied Animal Welfare Science · doi:10.1080/10888700701313595 · Cited by 226 · see citing works
A standardized ethogram for the felidae: A tool for behavioral researchers
Stanton, L. A., Sullivan, M., & Fazio, J. M. (2015) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2015.04.001 · Cited by 213 · see citing works
Behavioral and adrenocortical responses to environmental changes in leopard cats (Felis bengalensis)
Carlstead, K., Brown, J. L., & Seidensticker, J. C., IV (1993) · Zoo Biology · doi:10.1002/zoo.1430120403 · Cited by 211 · see citing works
A preliminary model of human-animal relationships in the zoo
Hosey, G. (2008) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2007.04.013 · Cited by 197 · see citing works
A note on the influence of visitors on the behaviour and welfare of zoo-housed gorillas
Wells, D. L. (2005) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2005.06.019 · Cited by 157 · see citing works
Mallapur, A., Sinha, A., & Waran, N. K. (2005) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2005.02.012 · Cited by 153 · see citing works
Evolutionary Biology and Conservation of Titis, Sakis and Uacaris
(2013) · Cambridge University Press eBooks · doi:10.1017/cbo9781139034210 · Cited by 152 · see citing works
Effects of browse, human visitors and noise on the behaviour of captive orang-utans
Birke, L. (2002) · Animal Welfare · doi:10.1017/s0962728600028141 · Cited by 151 · see citing works
Evidence that zoo visitors influence HPA activity in spider monkeys (Ateles geoffroyii rufiventris)
Davis, N., Schaffner, C. M., & Smith, T. E. (2005) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2004.08.020 · Cited by 128 · see citing works
Owen, M. A., Swaisgood, R. R., Czekala, N. M., Steinman, K., & Lindburg, D. G. (2004) · Zoo Biology · doi:10.1002/zoo.10124 · Cited by 118 · see citing works
The Effects of Visitor Density and Intensity on the Behavior of Two Captive Jaguars (Panthera onca)
Sellinger, R. L., & Ha, J. C. (2005) · Journal of Applied Animal Welfare Science · doi:10.1207/s15327604jaws0804_1 · Cited by 108 · see citing works
Mallapur, A., & Chellam, R. (2002) · Zoo Biology · doi:10.1002/zoo.10063 · Cited by 105 · see citing works
Number of nearby visitors and noise level affect vigilance in captive koalas
Larsen, M. J., Sherwen, S. L., & Rault, J.-L. (2014) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2014.02.005 · Cited by 102 · see citing works
Visitor effects on anxiety in two captive groups of western lowland gorillas
Carder, G., & Semple, S. (2008) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2008.06.001 · Cited by 92 · see citing works
Group differences in captive gorillas’ reaction to large crowds
Kuhar, C. W. (2008) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2007.04.011 · Cited by 83 · see citing works
Visitor behavior in zoos: A review
Davey, G. (2006) · Anthrozoös · doi:10.2752/089279306785593838 · Cited by 79 · see citing works
Powell, D., Carlstead, K., Tarou, L. R., Brown, J. L., & Monfort, S. L. (2006) · Zoo Biology · doi:10.1002/zoo.20098 · Cited by 76 · see citing works
Behavioral responses to the zoo environment by white handed gibbons
Cooke, C. M., & Schillaci, M. A. (2007) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2006.06.016 · Cited by 61 · see citing works
Poirier, C., & Melissa Bateson, B. (2017) · Neuroscience & Biobehavioral Reviews · doi:10.1016/j.neubiorev.2017.09.010 · Cited by 54 · see citing works
Pifarré, M., Valdez, R., González-Rebeles, C., Vázquez, C., Romano, M., & Galindo, F. (2012) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2011.11.015 · Cited by 54 · see citing works
Use of Enclosure Space by Captive Lion-Tailed Macaques (Macaca silenus) Housed in Indian Zoos
Mallapur, A., Waran, N. K., & Sinha, A. (2005) · Journal of Applied Animal Welfare Science · doi:10.1207/s15327604jaws0803_2 · Cited by 46 · see citing works
Kowalewski, M. M., Garber, P. A., Cortés‐Ortiz, L., Urbani, B., & Youlatos, D. (2014) · Springer eBooks · doi:10.1007/978-1-4939-1960-4 · Cited by 41 · see citing works
Effect of visitors on the behaviour of female Cheetahs <i>Acinonyx jubutus</i> and cubs
O'DONOVAN, D., HINDLE, J. E., McKEOWN, S., & O'DONOVAN, S. (1993) · International Zoo Yearbook · doi:10.1111/j.1748-1090.1993.tb03542.x · Cited by 40 · see citing works
Evaluation of different observational sampling regimes for use in zoological parks
Margulis, S. W., & Westhus, E. J. (2007) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2007.05.001 · Cited by 37 · see citing works
Ozella, L., Anfossi, L., Di Nardo, F., & Pessani, D. (2017) · General and Comparative Endocrinology · doi:10.1016/j.ygcen.2015.12.002 · Cited by 32 · see citing works
Coelho, C. M., de Azevedo, C. S., & Young, R. J. (2011) · Zoo Biology · doi:10.1002/zoo.20410 · Cited by 28 · see citing works
Self-citationEffect of Wood-Pile Feeders on the Behaviour of Captive Bush Dogs (Speothos Venaticos)
Ings, R., Waran, N. K., & Young, R. J. (1997) · Animal Welfare · doi:10.1017/s0962728600019618 · Cited by 20 · see citing works
Self-citationEffect of visitors on the behaviour of female Cheetahs Acinonyx jubutus and cubs
O’Donovan, D., HINDLE, J. E., McKeown, S., & O'DONOVAN, S. (1992) · International Zoo Yearbook · doi:10.1111/j.1748-1090.1992.tb02508.x · Cited by 18 · see citing works
Etograma do Eira barbara (Carnivora: Mustelidae) em cativeiro
Pereira, R. L. A., & de Oliveira, M. A. B. (2010) · Revista de Etologia · Cited by 7 · see citing works
Górecki, M. T., Juszkiewicz, A., Graclik, A., & Kala, B. (2011) · Zoo Biology · doi:10.1002/zoo.20412 · Cited by 6 · see citing works
de Carvalho, T. S. G., Zangerônimo, M. G., Saad, C. E. D. P., de Assis, V. D. L., & Ribeiro, V. M. P. (2017) · Bioscience Journal · doi:10.14393/bj-v33n2-32915 · Cited by 1 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
The visitor effect on zoo animals: implications and opportunities for zoo animal welfare
Sherwen, S. L., & Hemsworth, P. H. (2019) · Animals · doi:10.3390/ani9060366 · Cited by 267 · see citing works
de Azevedo, C. S., Cipreste, C. F., Pizzutto, C. S., & Young, R. J. (2023) · Animals · doi:10.3390/ani13081277 · Cited by 82 · see citing works
Self-citationImpacts of COVID-19 on Animals in Zoos: A Longitudinal Multi-Species Analysis
Williams, E., Carter, A. J., Rendle, J., & Ward, S. J. (2021) · Journal of Zoological and Botanical Gardens · doi:10.3390/jzbg2020010 · Cited by 40 · see citing works
The impact of visitors on non-primate species in zoos: a quantitative review
Williams, E., Hunton, V., Hosey, G., & Ward, S. J. (2023) · Animals · doi:10.3390/ani13071178 · Cited by 38 · see citing works
Preliminary investigation of the effects of a concert on the behavior of zoo animals
Harley, J. J., Rowden, L. J., Clifforde, L. M., Power, A., & Stanley, C. R. (2022) · Zoo Biology · doi:10.1002/zoo.21676 · Cited by 25 · see citing works
Boyle, S. A., Berry, N., Cayton, J., Ferguson, S., Gilgan, A., Khan, A. A., Lam, H. B.-L., Leavelle, S. E., Mulder, I. A., Myers, R., et al. (2020) · Animals · doi:10.3390/ani10112108 · Cited by 26 · see citing works
Jones, M., Gartland, K. N., & Fuller, G. A. (2021) · Animal Behavior and Cognition · doi:10.26451/abc.08.04.06.2021 · Cited by 20 · see citing works
Fink, L. B., Scarlata, C. D., VanBeek, B., Bodner, T., & Wielebnowski, N. C. (2021) · Animals · doi:10.3390/ani11123526 · Cited by 21 · see citing works
Kelly, R. J., Freeman, M. S., & Rose, P. E. (2025) · Frontiers in Ethology · doi:10.3389/fetho.2025.1517294 · Cited by 20 · see citing works
Klich, D., Łopucki, R., Gałązka, M., Ścibior, A., Gołębiowska, D., Brzezińska, R., Kruszewski, B., Kaleta, T., & Olech, W. (2021) · Acta veterinaria Scandinavica · doi:10.1186/s13028-021-00589-9 · Cited by 18 · see citing works
Behavioral Assessment of Six Reptile Species during a Temporary Zoo Closure and Reopening
Hamilton, J., Gartland, K. N., Jones, M., & Fuller, G. A. (2022) · Animals · doi:10.3390/ani12081034 · Cited by 18 · see citing works
Farsi, H., Harti, D., Achaâban, M. R., Piro, M., Ouassat, M., Challet, É., Pévet, P., & Allali, K. E. (2021) · Chronobiology International · doi:10.1080/07420528.2021.1984936 · Cited by 15 · see citing works
Finch, K., Leary, M., Holmes, L., & Williams, L. J. (2022) · Journal of Zoological and Botanical Gardens · doi:10.3390/jzbg3030030 · Cited by 13 · see citing works
López-Álvarez, J., Sanjorge, Y., Soloaga, S., Crailsheim, D., & Llorente, M. (2019) · Animals · doi:10.3390/ani9060347 · Cited by 11 · see citing works
Chiapero, F., Ferrari, H. R., Prieto, M. V., Capocasa, M. C. G., & Busso, J. M. (2020) · Journal of Applied Animal Welfare Science · doi:10.1080/10888705.2020.1799214 · Cited by 10 · see citing works
Visitor preferences and satisfaction in Attica zoological park, Greece
Karanikola, P. P., Panagopoulos, Τ., Tampakis, S. A., & Tampakis, A. (2020) · Heliyon · doi:10.1016/j.heliyon.2020.e04935 · Cited by 11 · see citing works
Chiapero, F., Ferrari, R. H., Guglielmetti, A., Capocasa, M. C. G., & Busso, J. M. (2020) · Zoo Biology · doi:10.1002/zoo.21574 · Cited by 9 · see citing works
The Effects of Light on Vertebrate Welfare: A Review
de Azevedo, C. S., Goulart, V. D. L. R., Pizzutto, C. S., Cipreste, C. F., Teixeira, C. P., & Young, R. J. (2025) · Animals · doi:10.3390/ani15223329 · Cited by 8 · see citing works
Self-citationWilliams, E., Sadler, J., Rutter, S. M., Mancini, C., Nawroth, C., Neary, J. M., Ward, S. J., Charlton, G. L., & Beaver, A. (2024) · Animal Welfare · doi:10.1017/awf.2024.23 · Cited by 7 · see citing works
The Impacts of Evening Events in Zoos: A Christmas Event at Knowsley Safari
Williams, E., Fulwell, T., Walsh, N. D., Harley, J. J., & Johnson, B. (2023) · Journal of Zoological and Botanical Gardens · doi:10.3390/jzbg4010003 · Cited by 5 · see citing works
Do Snakes Give a Hiss? Examining the Impact of Zoo Visitors on Captive Snakes
Hanson, S. L., Cooper‐Rogers, B., Klingner, P., Olijnyk, P., & Fernandez, E. J. (2025) · Zoo Biology · doi:10.1002/zoo.70033 · Cited by 4 · see citing works
A Metric-Based, Meta-Analytic Appraisal of Environmental Enrichment Efficacy in Captive Primates
Duncan, L. M., & Pillay, N. (2025) · Animals · doi:10.3390/ani15060799 · Cited by 6 · see citing works
French, F., Gupfinger, R., & Kendrick, P. (2018) · International Conference on Animal-Computer Interaction (ACI) · doi:10.1145/3295598.3314845 · Cited by 4 · see citing works
Behavioral Responses of Captive Corvids to the Presence of Visitors
Wascher, C. A. F., Baur, N., Hengl, M., Köck, C., Pegger, T., Schindlbauer, J., & Wemer, L. (2021) · Animal Behavior and Cognition · doi:10.26451/abc.08.04.03.2021 · Cited by 4 · see citing works
Free, D., Justice, W. S. M., Smith, S. J., Howard, V., & Wolfensohn, S. (2022) · Journal of Zoological and Botanical Gardens · doi:10.3390/jzbg3030032 · Cited by 4 · see citing works
Do not disturb: Visitors' effect on the behavior and welfare of female and male big cats in zoos
Spiezio, C., Galardi, E. G., Sandri, C., & Regaiolli, B. (2023) · Zoo Biology · doi:10.1002/zoo.21789 · Cited by 3 · see citing works
An Examination of Visitor and Tiger Activity Between Two Zoo Tiger Groups
Li, C., Alostad, Z., Crittle, C., & Fernandez, E. J. (2025) · Veterinary Medicine and Science · doi:10.1002/vms3.70286 · Cited by 3 · see citing works
da Silva, M. M., de Faria, C. M., Sá, F. D. S., Costa, D. D. L., da Silva, B. C., de Deus, G. L., Young, R. J., & de Azevedo, C. S. (2020) · Journal of Natural History · doi:10.1080/00222933.2020.1819453 · Cited by 3 · see citing works
Self-citationLee, S., Ryu, H., Yi, Y., Jang, S., Gye, H., Choi, A., Cho, H., Lee, B., & Choe, J. C. (2022) · Scientific Reports · doi:10.1038/s41598-022-23196-8 · Cited by 4 · see citing works
Rezende, Y. G. D. A., de Queiroz, M. B., Young, R. J., & Vasconcellos, A. D. S. (2023) · Animal Welfare · doi:10.1017/awf.2023.34 · Cited by 2 · see citing works
Self-citationFink, L. B., VanBeek, B., Scarlata, C. D., Lewis, K. D., & Wielebnowski, N. C. (2025) · Zoo Biology · doi:10.1002/zoo.21906 · Cited by 2 · see citing works
Effect of Noise on Bornean Orangutans’ Glucocorticoid Metabolite (GCM) Levels
de Queiroz, M. B., Passos, L. F., de Azevedo, C. S., Schork, I. G., Palme, R., Davies, W. J., & Young, R. J. (2025) · Animals · doi:10.3390/ani15233384 · Cited by 1 · see citing works
Self-citationThe ‘Visitor Effect’ in Non-primate Zoo Species: What Do We Know and Where Should We Go Next?
Williams, E., Hunton, V., Ward, S. J., & Hosey, G. (2024) · CABI eBooks · doi:10.1079/9781800622715.0010 · Cited by 1 · see citing works
Behavioral Peculiarities of the Equidae Family in the Conditions of the Moscow Zoo Stud Farm
Ksenofontova, A. A., Александровна, В. О., Ivanov, A. A., Анатольевич, К. Д., Savchuk, S. V., Саковцева, Т. В., & Kubatbekov, T. S. (2021) · Journal Of Biochemical Technology · doi:10.51847/oog0g3ci88
Un homenaje a Carlos Fuentes : sus lectores
Álvarez, A., & Víctor, A. (2000) · DSpace (Universidad Veracruzana)
We’re too busy singing: acoustic analysis with apes
French, F., Good, S., Makaddem, K., Frost, N., & Finch, K. (2024) · International Conference on Animal-Computer Interaction (ACI) · doi:10.1145/3702336.3702349
Response of captive squirrel monkeys to people
Pozo, M. G., & Águeda, F. J. D. M. (2025) · Folia Primatologica · doi:10.1163/14219980-bja10051
Klich, D., Łopucki, R., Gałązka, M., Ścibior, A., Gołębiowska, D., Brzezińska, R., Kruszewski, B., Kaleta, T., & Olech, W. (2021) · Figshare · doi:10.6084/m9.figshare.14767458
Gartland, K. N., Bovee, E., Reed, A. N., & Fuller, G. A. (2026) · American Journal of Primatology · doi:10.1002/ajp.70183
Beniaich, Y., Farsi, H., Piro, M., Achaâban, M. R., Pévet, P., Challet, É., Satté, A., & Allali, K. E. (2026) · Journal of Comparative Physiology B · doi:10.1007/s00360-026-01711-x
Propuesta de un modelo de bienestar animal en jaguares (Panthera onca) bajo cuidado profesional
Cevallos, P. C. P., López, R. A. S., Torres, N. E. S., & Cornejo, M. E. M. (2026) · ASCE MAGAZINE · doi:10.70577/asce.v5i3.716
Propuesta de un modelo de bienestar animal en jaguares (Panthera onca) bajo cuidado profesional
Cevallos, P. C. P., López, R. A. S., Torres, N. E. S., & Cornejo, M. E. M. (2026) · Saber Estratégico Internacional · doi:10.70577/s.e.v4i3.132
- Authors
- Queiroz, M. B., & Young, R. J.
- Affiliations
- Ministry of Education (BR)
- Pontifícia Universidade Católica de Minas Gerais (BR)
- Corresponding author
- Young, Robert J.
- Venue
- Animals
- Publisher
- MDPI AG
- Published
- 2018-08-14
- Volume
- 8
- Issue
- 8
- Pages
- 139
- ISSN
- 2076-2615 (ISSN-L)
- PMC
- PMC6115739
- OpenAlex
- W2885436335
- Cited by
- 43
- References
- 39
- Citations by year
- 2026: 4 · 2025: 8 · 2024: 3 · 2023: 5 · 2022: 6 · 2021: 8 · 2020: 5 · 2019: 2 · 2018: 1
- FWCI
- 5.87
- Type
- journal article
- Language
- en
- Open access
- gold
- dx.doi.org
- Licence
- Locations
- Animals (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- University of Salford Institutional Repository (University of Salford) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Fundação de Amparo à Pesquisa do Estado de Minas Gerais
- Topics
- Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
- Physical Sciences › Environmental Science › Ecology › Wildlife Ecology and Conservation
- Social Sciences › Psychology › Social Psychology › Primate Behavior and Ecology
- Keywords
- animal behavior, habitat type, activity cycles, locomotor behaviour, resting behavior, mitigation measures, captive animals
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review