Modern zoos strive to educate visitors about zoo animals and their wild counterparts' conservation needs while fostering appreciation for wildlife in general. This research review examines how zoos influence those who visit them. Much of the research to-date examines zoo visitors' behaviors and perceptions in relation to specific exhibits, animals, and/or programs. In general, visitors have more positive perceptions and behaviors about zoos, their animals, and conservation initiatives the more they interact with animals, naturalistic exhibits, and zoo programming/staff. Furthermore, zoo visitors are receptive to conservation messaging and initiatives at zoos and are more likely to participate in on-site conservation opportunities as opposed to after their visits. The research also suggests that repeat visitors are even more inclined to seek out conservation efforts compared to those visiting zoos for the first time. While current research suggests that repeat visitors are more likely to engage in conservation efforts, little is known about causal factors related to such findings, and almost no research exists to-date comparing the conservation efforts of visitors vs. non-visitors. This latter comparison will likely play a greater role in future zoo visitor research, since it poses one of the most important metrics for evaluating the specific effects visiting a zoo can have on people engaging in conservation efforts in general.

The modern zoo has been associated with two major behavioral welfare advances: (a) the use of training to increase voluntary husbandry care, and (b) the implementation of environmental enrichment to promote naturalistic behaviors. Both practices have their roots in behavior analysis, or the operant conditioning-centered, reward-based approach to behavioral psychology. Operant conditioning served as the foundation for the development of reinforcement-based training methods commonly used in zoos to make veterinary and husbandry procedures easier and safer for animals and their caregivers. Likewise, operant conditioning, with its focus on arranging environmental antecedents and consequences to change behavior, also provided a framework for successful environmental enrichment practices. In this paper, we outline the key individuals and events that shaped two of the cornerstones of the modern zoo: (1) the emergence of reward-based husbandry training practices, and (2) the engineering of environmental enrichment. In addition, we (3) suggest ways in which behavior analysis can continue to advance zoo welfare by (i) expanding the efficacy of environmental enrichment, (ii) using within-subject methodology, and (iii) improving animal-visitor interactions. Our goal is to provide a historical and contextual reference for future efforts to improve the well-being of zoo animals.

Animal-Visitor Interactions (AVIs) have become commonplace in zoological institutions and facilities globally. However, most AVI research focuses on the effects of visitors on the welfare of animals, with considerably fewer studies examining the visitor experience itself. Furthermore, robust evaluations of the efficacy of zoo education programs and engagements for increasing visitor awareness of conservation issues, and for fostering long-term pro-conservation behavior changes in them, are under-researched. This paper reviews the current literature that pertains to the effects of zoo visitation and AVIs on visitor perceptions, beliefs, and attitudes. We briefly note some of the known effects that zoo visitors have on zoo animals, then explore the effects that factors such as enclosure design, animal visibility and behaviors, and AVIs can have on visitors’ overall experience whilst attending the zoo. We suggest that future research needs to more closely examine the relationships and interactions between zoo visitors and zoo animals; why some zoo visitors over others repeat visitation; what the differences in beliefs and attitudes may be between “zoo visitors” and “non-zoo visitors” (i.e., other general public); and to make a concerted effort to understand: (1) what visitors do after they leave the zoo, and (2) whether visitors adopt long-term pro-conservation behaviors into their daily lives. We further suggest that future research needs to start investigating indirect measures related to the visitor experience, such as: (a) individual conservation support outside of the zoo; (b) internet activity; (c) changes in sustainable purchasing practices related to knowledge gains; (d) financial investment in sustainable or ethical companies after knowledge gains; (e) and the longitudinal effects of zoo visits.

Husbandry training and environmental enrichment are both important advancements associated with current behavioural welfare practices. Additionally, the use of training procedures has been proposed as a form of enrichment, with the implication that training can produce beneficial behavioural welfare results. This paper examines the concept of training as enrichment through three distinct ways training procedures could enrich: (i) training facilitates enrichment usage; (ii) training modifies interactions, conspecific or otherwise; and (iii) training expands behavioural repertoires. Within each category, the paper focuses on past research that provides empirical support for training functioning as enrichment, as well as related areas of research that provide additional evidence. Previous studies support the claim that training is enriching, with additional research necessary to better understand how prevalent and under what conditions training procedures function as enrichment. Future training research should examine these potential enrichment effects, including methodology that allows for comparisons to traditional enrichment, the use of welfare diversity/variability indices, and the effects of learning on trainers and trainees alike.