What science tells us about choice, control, and autonomy for animals living in zoos.

Science says choice matters. 

But who controls the choices that matter most?

A polar bear is allowed to choose whether to remain on exhibit or enter an indoor space.

An elephant can walk away from a training session.

A primate can retreat from public view.

An ambassador animal may be given an opportunity to “opt out” of participating in a program.

These choices matter.

Scientific research increasingly supports the importance of giving animals meaningful opportunities to make choices and exert greater control over their environments. Studies suggest that increased choice can improve welfare in some captive animals—reducing certain abnormal behaviors, encouraging positive behaviors, and giving animals greater influence over their daily experiences.

Modern zoos, including institutions accredited by the Association of Zoos and Aquariums (AZA), increasingly incorporate the language and principles of “choice and control” into animal-welfare practices.

But the science raises a deeper question:

How much choice constitutes meaningful control?

-An animal may be able to choose whether to go indoors or outdoors—but not where it lives.

-It may choose whether to participate in a particular training session—but not whether it is transferred to another institution.

-It may retreat from visitors—but not choose whether its home is surrounded by visitors every day.

-It may voluntarily enter a transport crate—but does that necessarily mean it has chosen everything that happens afterward?

And an animal may be offered enrichment—but humans generally determine what is provided, when it appears, and when it is removed.

These distinctions matter.

Scientific evidence supports the welfare value of providing animals with greater agency. The Association of Zoos and Aquariums (AZA) also recognizes concepts of choice and control within its animal-care framework.

However, the available published research does not appear to establish that AZA accreditation itself guarantees a standardized, scientifically measured level of meaningful agency or autonomy across animals housed at accredited institutions.

Nor does the available evidence establish that offering limited choices within captivity is equivalent to providing broader autonomy.

Perhaps, then, the question is not whether zoo animals are given choices.

Clearly, many are.

The more difficult question is:

Who ultimately controls the choices that matter most?

-Where the animal lives.

-Who it lives with.

-Whether and with whom it breeds.

-Whether its offspring remain with it.

Whether it is transferred.

-The boundaries of where it can go.

And, ultimately, whether it remains in captivity.

The science tells us that choice matters.

The ethical question is whether choice within confinement should be confused with control over one’s life.