When pets become pests: the role of the exotic pet trade in producing invasive vertebrate animals
Open accessAbstract
The annual trade in exotic vertebrates as pets is a multi‐billion‐dollar global business. Thousands of species, and tens of millions of individual animals, are shipped both internationally and within countries to satisfy this demand. Most research on the exotic pet trade has focused on its contribution to native biodiversity loss and disease spread. Here, we synthesize information across taxa and research disciplines to document the exotic pet trade's contribution to vertebrate biological invasions. We show recent and substantial worldwide growth in the number of non‐native animal populations introduced via this invasion pathway, which demonstrates a strong potential to increase the number of invasive animals in the future. Key to addressing the invasion threat of exotic pets is learning more about the socioeconomic forces that drive the massive growth in the exotic pet market and the socioecological factors that underlie pet release by owners. These factors likely vary according to cultural pet‐keeping traditions across regions and whether purchases were legal or illegal. These gaps in our understanding of the exotic pet trade must be addressed in order to implement effective policy solutions.
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The dramatic recent growth in trade of unusual pets is another growing threat.
“The dramatic recent growth in trade of unusual pets is another growing threat (Lockwood et al., 2019).”
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Magalhães, A. L. B., Bezerra, L. A. V., Daga, V. S., Pelicice, F. M., Vitule, J. R. S., & de Brito, M. F. G. (2021) · Neotropical Ichthyology · doi:10.1590/1982-0224-2020-0147 · Cited by 30 · see citing works
Toomes, A., García‐Díaz, P., Stringham, O., Ross, J. V., Mitchell, L., & Cassey, P. (2022) · Journal of Applied Ecology · doi:10.1111/1365-2664.14138 · Cited by 30 · see citing works
Self-citationAssessing preferences and motivations for owning exotic pets: Care matters
Hausmann, A., Capano, G. C., Fraser, I., & Minin, E. D. (2023) · Biological Conservation · doi:10.1016/j.biocon.2023.110007 · Cited by 29 · see citing works
Invasion success and tolerance to urbanization in birds
González‐Lagos, C., Cardador, L., & Sol, D. (2021) · Ecography · doi:10.1111/ecog.05826 · Cited by 29 · see citing works
Technological innovations enhance invasive species management in the anthropocene
Fricke, R. M., & Olden, J. D. (2023) · BioScience · doi:10.1093/biosci/biad018 · Cited by 32 · see citing works
Risky Business: Live Non-CITES Wildlife UK Imports and the Potential for Infectious Diseases
Green, J., Coulthard, E., Norrey, J., Megson, D., & D’Cruze, N. C. (2020) · Animals · doi:10.3390/ani10091632 · Cited by 28 · see citing works
Caught in the act: Youtube™ reveals invisible fish invasion pathways in Brazil
Magalhães, A. L. B., Azevedo-Santos, V. M., & Pelicice, F. M. (2021) · Journal of Applied Ichthyology · doi:10.1111/jai.14159 · Cited by 27 · see citing works
Morelli, T. L., Brown‐Lima, C. J., Allen, J. M., Beaury, E. M., Fusco, E. J., Plotkin, A. B., Laginhas, B. B., Quirion, B. R., Griffin, B., McLaughlin, B. C., et al. (2021) · Biological Invasions · doi:10.1007/s10530-021-02584-7 · Cited by 27 · see citing works
Heinrich, S., Toomes, A., Shepherd, C. R., Stringham, O., Swan, M. H., & Cassey, P. (2021) · Animal Conservation · doi:10.1111/acv.12721 · Cited by 26 · see citing works
Self-citationThe Future of Invasion Science Needs Physiology
Boardman, L., Lockwood, J. L., Angilletta, M. J., Krause, J. S., Lau, J. A., Loik, M. E., Simberloff, D., Thawley, C. J., & Meyerson, L. A. (2022) · BioScience · doi:10.1093/biosci/biac080 · Cited by 25 · see citing works
Self-citationTropical cities as windows into the ecosystems of our present and future
Bonebrake, T. C., Tsang, T. P. N., Yu, N., Wang, Y., Ledger, M. J., Tilley, H. B., Yau, E. Y. H., Andersson, A. A., Boyle, M. J. W., Lee, K. W. K., et al. (2024) · Biotropica · doi:10.1111/btp.13369 · Cited by 24 · see citing works
Perdomo, E. B., Padilla, J. E. A., & Dewitte, S. (2021) · Animals · doi:10.3390/ani11020524 · Cited by 24 · see citing works
dos Santos, C. F., Acosta, A. L., Halinski, R., dos Santos, P. D. D. S., Borges, R. C., Giannini, T. C., & Blochtein, B. (2021) · Journal of Applied Ecology · doi:10.1111/1365-2664.14108 · Cited by 24 · see citing works
From tigers to axolotls: Why people keep exotic pets in Russia
Shukhova, S., & MacMillan, D. C. (2020) · People and Nature · doi:10.1002/pan3.10125 · Cited by 23 · see citing works
Toomes, A., Stringham, O., Mitchell, L., Ross, J. V., & Cassey, P. (2020) · NeoBiota · doi:10.3897/neobiota.60.51431 · Cited by 23 · see citing works
Self-citationInvasive Species Policy Must Embrace a Changing Climate
Bradley, B. A., Beaury, E. M., Fusco, E. J., & Lopez, B. E. (2022) · BioScience · doi:10.1093/biosci/biac097 · Cited by 23 · see citing works
Wildlife Exploitation of Anthropogenic Change: Interactions and Consequences
Willmott, N. J., Wong, B. B. M., Lowe, E. C., McNamara, K. B., & Jones, T. M. (2022) · The Quarterly Review of Biology · doi:10.1086/718748 · Cited by 22 · see citing works
The continuing march of Common Green Iguanas: arrival on mainland Asia
van den Burg, M. P., Belleghem, S. M. V., & Villanueva, C. N. D. J. (2020) · Journal for Nature Conservation · doi:10.1016/j.jnc.2020.125888 · Cited by 22 · see citing works
Reciprocal human-natural system feedback loops within the invasion process
Sinclair, J. S., Brown, J. A., & Lockwood, J. L. (2020) · NeoBiota · doi:10.3897/neobiota.62.52664 · Cited by 22 · see citing works
Self-citationScale of unregulated international trade in Australian reptiles and amphibians
Chekunov, S., Stringham, O., Toomes, A., Prowse, T. A. A., & Cassey, P. (2024) · Conservation Biology · doi:10.1111/cobi.14355 · Cited by 21 · see citing works
Self-citationExploring the Effects of Geopolitical Shifts on Global Wildlife Trade
Ribeiro, J., Bingre, P., Strubbe, D., Santana, J., Capinha, C., Araújo, M. B., & Reino, L. (2022) · BioScience · doi:10.1093/biosci/biac015 · Cited by 21 · see citing works
Status, challenges and pathways to the sustainable use of wild species
Fromentin, J., Emery, M. R., Donaldson, J., Balachander, G., Barron, E. S., Chaudhary, R. P., Danner, M.-C., Gasalla, M. A., Hallosserie, A., Halmy, M. W. A., et al. (2023) · Global Environmental Change · doi:10.1016/j.gloenvcha.2023.102692 · Cited by 21 · see citing works
Tarantulas (Araneae: Theraphosidae) in the pet trade in South Africa
Shivambu, T. C., Shivambu, N., Lyle, R., Jacobs, A., Kumschick, S., Foord, S. H., & Robertson, M. P. (2020) · African Zoology · doi:10.1080/15627020.2020.1823879 · Cited by 21 · see citing works
Frog in the well: A review of the scientific literature for evidence of amphibian sentience
Lambert, H., Elwin, A., & D’Cruze, N. C. (2022) · Applied Animal Behaviour Science · doi:10.1016/j.applanim.2022.105559 · Cited by 20 · see citing works
Global invasion and biosecurity risk from the online trade in ornamental crayfish
Olden, J. D., & Carvalho, F. (2024) · Conservation Biology · doi:10.1111/cobi.14359 · Cited by 20 · see citing works
Harrington, L. A., Mookerjee, A., Kalita, M., Saikia, A., Macdonald, D. W., & D’Cruze, N. C. (2021) · Biological Conservation · doi:10.1016/j.biocon.2021.109377 · Cited by 19 · see citing works
Threats at home? Assessing the potential ecological impacts and risks of commonly traded pet fishes
Dickey, J. W. E., Arnott, G., McGlade, C. L. O., Moore, A., Riddell, G. E., & Dick, J. T. A. (2022) · NeoBiota · doi:10.3897/neobiota.73.80542 · Cited by 19 · see citing works
Biological invasions and human dimensions: We still need to work hard on our social perspectives
Bortolus, A., & Schwindt, E. (2022) · Ecología Austral · doi:10.25260/ea.22.32.2.1.1890 · Cited by 19 · see citing works
White, S. L., Fox, D. A., Beridze, T., Bolden, S. K., Johnson, R. L., Savoy, T. F., Scheele, F., Schreier, A. D., & Kazyak, D. C. (2022) · Fisheries · doi:10.1002/fsh.10865 · Cited by 19 · see citing works
Untangling the web: dynamics of Australia's online terrestrial invertebrate trade
Lassaline, C. R., Stringham, O., Moncayo, S., Toomes, A., & Cassey, P. (2023) · Austral Entomology · doi:10.1111/aen.12662 · Cited by 19 · see citing works
Self-citationIdentifying potential emerging invasive non‐native species from the freshwater pet trade
Dickey, J. W. E., Liu, C., Briski, E., Wolter, C., Moesch, S., & Jeschke, J. M. (2023) · People and Nature · doi:10.1002/pan3.10535 · Cited by 20 · see citing works
Identifying inconsistencies in exotic pet regulations that perpetuate trade in risky species
Pratt, E. N., Lockwood, J. L., King, E. G., & Pienaar, E. F. (2023) · Conservation Biology · doi:10.1111/cobi.14189 · Cited by 19 · see citing works
Self-citationMazzamuto, M. V., Wauters, L. A., & Koprowski, J. L. (2021) · Biology · doi:10.3390/biology10101046 · Cited by 19 · see citing works
Reliability of social media data in monitoring the global pet trade in ants
Gippet, J. M. W., Sherpa, Z., & Bertelsmeier, C. (2022) · Conservation Biology · doi:10.1111/cobi.14041 · Cited by 18 · see citing works
Non-native species in Poyang Lake Basin: status, threats and management
Xiong, W., Xie, D., Wang, Q., Wang, H., Wu, Z., Sun, H., Li, T., & Bowler, P. A. (2023) · Aquatic Invasions · doi:10.3391/ai.2023.18.1.103610 · Cited by 20 · see citing works
The dark web trades wildlife, but mostly for use as drugs
Stringham, O., Maher, J., Lassaline, C. R., Wood, L., Moncayo, S., Toomes, A., Heinrich, S., Watters, F., Drake, C., Chekunov, S., et al. (2023) · People and Nature · doi:10.1002/pan3.10469 · Cited by 19 · see citing works
Self-citationNovák, J., Hohl, D., Stuchlík, M., Hofmann, J., Tlusty, M. F., Magalhães, A. L. B., Maceda‐Veiga, A., Akmal, S. G., Yue, G. H., Kumkar, P., et al. (2025) · Reviews in Aquaculture · doi:10.1111/raq.13008 · Cited by 17 · see citing works
Self-citationPet or pest? Stable isotope methods for determining the provenance of an invasive alien species
Hill, K. G. W., Nielson, K. E., Tyler, J. J., McInerney, F. A., Doubleday, Z. A., Frankham, G. J., Johnson, R. N., Gillanders, B. M., Delean, S., & Cassey, P. (2020) · NeoBiota · doi:10.3897/neobiota.59.53671 · Cited by 17 · see citing works
Self-citationExotic gastropods for sale: an assessment of land and aquatic snails in the South African pet trade
Shivambu, T. C., Shivambu, N., & Downs, C. T. (2020) · Management of Biological Invasions · doi:10.3391/mbi.2020.11.3.11 · Cited by 17 · see citing works
On the Record: An Analysis of Exotic Pet Licences in the UK
Elwin, A., Green, J., & D’Cruze, N. C. (2020) · Animals · doi:10.3390/ani10122373 · Cited by 17 · see citing works
Quantifying global colonization pressures of alien vertebrates from wildlife trade
Li, Y., Blackburn, T. M., Luo, Z., Song, T., Watters, F., Li, W., Deng, T., Luo, Z., Li, Y., Du, J., et al. (2023) · Nature Communications · doi:10.1038/s41467-023-43754-6 · Cited by 17 · see citing works
Investigating Support for Management of the Pet Trade Invasion Risk
Episcopio‐Sturgeon, D. J., & Pienaar, E. F. (2020) · Journal of Wildlife Management · doi:10.1002/jwmg.21867 · Cited by 17 · see citing works
Self-citationMo, M., & Mo, E. (2022) · Reptiles & Amphibians · doi:10.17161/randa.v29i1.16269 · Cited by 17 · see citing works
Assessing the potential impacts of non-native small mammals in the South African pet trade
Shivambu, N., Shivambu, T. C., & Downs, C. T. (2020) · NeoBiota · doi:10.3897/neobiota.60.52871 · Cited by 17 · see citing works
Considerations for developing and implementing a safe list for alien taxa
Kumschick, S., Winzer, L. F., McCulloch-Jones, E. J., Chetty, D., Fried, J., Govender, T., Potgieter, L. J., Rapetsoa, M. C., Richardson, D. M., van Velden, J. L., et al. (2024) · BioScience · doi:10.1093/biosci/biad118 · Cited by 16 · see citing works
Jerikho, R., Akmal, S. G., Hasan, V., Yonvitner, Y., Novák, J., Magalhães, A. L. B., Maceda‐Veiga, A., Tlusty, M. F., Rhyne, A. L., Slavík, O., et al. (2023) · Scientific Reports · doi:10.1038/s41598-023-34356-9 · Cited by 15 · see citing works
Self-citationWho’s a pretty bird? Predicting the traded abundance of bird species in Australian online pet trade
Hill, K. G. W., Stringham, O., Moncayo, S., Toomes, A., Tyler, J. J., Cassey, P., & Delean, S. (2023) · Biological Invasions · doi:10.1007/s10530-023-03221-1 · Cited by 15 · see citing works
Self-citationExotic pets in Ireland: 1. Prevalence of ownership and access to veterinary services
Goins, M., & Hanlon, A. J. (2021) · Irish Veterinary Journal · doi:10.1186/s13620-021-00190-6 · Cited by 14 · see citing works
Dufour, P. C., Miot, E. F., So, T. C., Tang, S. L., Jones, E. E., Kong, T. C., Yuan, F. L., Sung, Y., Dingle, C., & Bonebrake, T. C. (2022) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2022.1011 · Cited by 14 · see citing works
Cumulative propagule pressure exerted by escaped pet parrots
Stanley, M. C., McNaughton, E. J., Fewster, R. M., & Galbraith, J. A. (2023) · Journal of Applied Ecology · doi:10.1111/1365-2664.14341 · Cited by 14 · see citing works
The need of centralized coordination to counter biological invasions in the European Union
Kurtul, I., & Haubrock, P. J. (2024) · Environmental Sciences Europe · doi:10.1186/s12302-024-00955-0 · Cited by 14 · see citing works
Snake pet ownership in the city: A case study in Greater Jakarta, Indonesia
Kusrini, M. D., Palesa, S. P., & Masy’ud, B. (2021) · Biodiversitas Journal of Biological Diversity · doi:10.13057/biodiv/d220424 · Cited by 15 · see citing works
Human activities favour prolific life histories in both traded and introduced vertebrates
Street, S. E., Gutiérrez, J. S., Allen, W. L., & Capellini, I. (2023) · Nature Communications · doi:10.1038/s41467-022-35765-6 · Cited by 13 · see citing works
The scientist eyes: monitoring YouTube™ to quantify aquatic pet release in Brazil
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Self-citationAlien birds in Argentina: pathways, characteristics and ecological roles
Codesido, M., & Drozd, A. A. (2021) · Biological Invasions · doi:10.1007/s10530-020-02444-w · Cited by 13 · see citing works
Deliveyne, N., Young, J. M., Austin, J. J., & Cassey, P. (2023) · NeoBiota · doi:10.3897/neobiota.82.97998 · Cited by 13 · see citing works
Self-citationReptile pet trade in Brazil: A regulatory approach to sustainable biodiversity conservation
Fonseca, É., Zank, C., Cechin, S. Z., & Both, C. (2021) · Conservation Science and Practice · doi:10.1111/csp2.504 · Cited by 12 · see citing works
Pili, A. N., Tingley, R., van Winkel, D., Maria, L., & Chapple, D. G. (2023) · Biological Conservation · doi:10.1016/j.biocon.2022.109860 · Cited by 13 · see citing works
The wild cost of invasive feral animals worldwide
Soto, I., Balzani, P., Oficialdegui, F. J., Molinero, C., Kouba, A., Ahmed, D. A., Turbelin, A. J., Hudgins, E. J., Bodey, T. W., Gojery, S. A., et al. (2023) · The Science of The Total Environment · doi:10.1016/j.scitotenv.2023.169281 · Cited by 13 · see citing works
Exotic pet trading and keeping: Proposing a model government consultation and advisory protocol
Warwick, C., & Steedman, C. (2021) · Journal of Veterinary Behavior · doi:10.1016/j.jveb.2021.03.002 · Cited by 12 · see citing works
Goins, M., & Hanlon, A. J. (2021) · Irish Veterinary Journal · doi:10.1186/s13620-021-00191-5 · Cited by 12 · see citing works
- Authors
- Lockwood, J. L., Welbourne, D. J., Romagosa, C. M., Cassey, P., Mandrak, N. E., Strecker, A., Leung, B., Stringham, O. C., Udell, B., Episcopio‐Sturgeon, D. J., Tlusty, M. F., Sinclair, J., Springborn, M. R., Pienaar, E. F., Rhyne, A. L., & Keller, R.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- University of Florida (US)
- The University of Adelaide (AU)
- University of Toronto (CA)
- Portland State University (US)
- McGill University (CA)
- University of Massachusetts Boston (US)
- University of California, Davis (US)
- Roger Williams University (US)
- Loyola University Chicago (US)
- Corresponding author
- Lockwood, Julie L
- ORCID
- Venue
- Frontiers in Ecology and the Environment
- Publisher
- Wiley
- Published
- 2019-06-03
- Volume
- 17
- Issue
- 6
- Pages
- 323-330
- ISSN
- 1540-9295 (ISSN-L)
- 1540-9309
- OpenAlex
- W2948749917
- Cited by
- 299
- References
- 53
- Citations by year
- 2026: 31 · 2025: 46 · 2024: 46 · 2023: 56 · 2022: 41 · 2021: 49 · 2020: 27 · 2019: 2 · 2018: 1
- FWCI
- 21.30
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Frontiers in Ecology and the Environment (publishedVersion, cc-by-nc-nd)
- Roger Williams University - Digital Commons (Roger Williams University) (submittedVersion)
- PDXScholar (Portland State University) (submittedVersion, cc-by-nc-nd)
- eScholarship (California Digital Library) (submittedVersion)
- UpSpace Institutional Repository (University of Pretoria) (submittedVersion, cc-by)
- Funders
- National Science Foundation (1052875)
- National Socio-Environmental Synthesis Center (1052875, DBI—1052875)
- Topics
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Wildlife Conservation and Criminology Analyses
- Physical Sciences › Environmental Science › Ecology › Animal Ecology and Behavior Studies
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ecology and Vegetation Dynamics Studies
- Keywords
- exotic pet trade, invasive vertebrates, biological invasions, illegal wildlife trade, invasive species policy, wildlife trade regulation
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.
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