Gorillas are neither uniformly left-handed nor uniformly right-handed. Individual gorillas may prefer the left hand, the right hand, or show little consistent preference. Across studies, a right-hand bias appears most reliably during coordinated, structured actions that require both hands, while simple reaching often produces no overall species-wide bias.
There is no single “gorilla-handedness”
Hand preference can be measured at two different levels. An individual gorilla may use one hand more often for a particular activity, but that does not mean every gorilla in the species shares the same dominant hand. Population-level handedness means that, taken together, significantly more animals favor one hand.
Gorilla results change with the behavior being tested. A gorilla may reach with either hand, then consistently use one hand to hold food while using the other to manipulate it. Researchers therefore distinguish between unimanual actions, such as a simple reach, and bimanual actions, in which the hands perform coordinated but different roles.
What studies find for different behaviors
| Behavior or comparison | Sample and finding | What it means |
|---|---|---|
| Spontaneous food reaching | 31 captive lowland gorillas (Annett and Annett, 1991): animals ranged from strongly left-preferent to strongly right-preferent, with most showing intermediate levels of preference. | No overall species bias; the group was approximately divided between left- and right-preferent animals. |
| Unimanual reaching | 35 captive gorillas (Meguerditchian and colleagues, 2010): “No population-level manual bias was found for unimanual actions.” | A simple one-handed reach does not reliably identify gorillas as right-handed. |
| Coordinated bimanual feeding | The same 35-gorilla study found significant population-level right-handedness when one hand held or framed food while the other processed it. | Right-hand preference is stronger when the task requires coordinated hand roles. |
| Comparative bimanual actions | A study of 777 great apes reported population-level right-handedness in gorillas, chimpanzees and bonobos; orangutans were left-handed in that comparison. | Some structured two-hand behaviors reveal a broader rightward pattern among several great-ape species. |
| Structured actions and hand transfers | 13 western lowland gorillas showed a significant population-level right-hand bias in a 2013 study. | Naturally organized, multi-step actions can expose a bias that casual reaching misses. |
Why some studies disagree
Not every coordinated task produces a statistically significant result. An earlier tube-task study of 31 captive gorillas found only a nonsignificant trend toward right-handedness. That result is compatible with a real tendency that is too small, too variable, or too dependent on the exact procedure to appear consistently in every experiment.
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Studies also differ in whether behavior is spontaneous or experimentally structured, how many animals are observed, which captive group they come from, and how an individual preference is classified statistically. A result from one task should not be generalized to every activity a gorilla performs.
Do individual gorillas keep the same preferred hand?
Often they do not. In a study of 22 captive gorillas, 10 showed no preference across the tested behaviors, while most of the others preferred one hand for only one behavior. A task-comparison study of three adult gorillas likewise found that increasing complexity did not automatically produce a right-hand bias. Its authors summarized the result this way: “a subject can be right-handed for a complex task and left-handed for another one.”
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This task-specificity is why labels such as “left-handed gorilla” or “right-handed gorilla” need a qualification: they should identify the behavior and the conditions in which the preference was observed.
Are gorillas ambidextrous?
“Ambidextrous” is not a precise biological category in these studies. Some gorillas use both hands about equally for a given task, and others switch hands between tasks. That flexibility can look ambidextrous, but it may reflect the demands of the action rather than an absence of all hand preference. A gorilla that reaches with either hand may still favor one hand for feeding, transferring an object, or another coordinated sequence.
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What about gestures and communication?
Hand preference is not limited to manipulating food or objects. Research on 35 captive gorillas compared manual signals with manipulative actions and found stronger right-lateralization for gestures than for manipulators. The pattern also changed with the interactional context and with whether a signal was directed toward another gorilla or toward a human. Before filtering, the dataset contained 7,421 conspecific-directed manipulators and 1,407 human-directed gestures.
This distinction matters because communication and object handling may involve different neural and social demands. A rightward bias in gestures should not be treated as proof that every other manual behavior is right-handed.
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How to interpret the evidence
- Simple reaching: usually provides weak or inconsistent evidence for a population-wide right bias.
- Coordinated two-hand actions: more often produce significant right-hand effects in gorillas.
- Individual preferences: can be left, right, mixed or absent, and may change with the task.
- Structured versus spontaneous behavior: organized sequences may reveal lateralization that casual observation does not.
- Communication versus manipulation: gestures can be more right-lateralized than object-directed actions.
Bottom line
Gorillas do not all share one dominant hand. The best-supported conclusion is that handedness is task-dependent and individual: many studies find a right-hand bias during coordinated bimanual or other structured actions, while simple reaching often shows no overall species bias. A gorilla can favor the right hand for one activity, the left for another, or show no stable preference at all.
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