In a 2022 study, buff-tailed bumble bees (Bombus terrestris) repeatedly rolled wooden balls without an apparent immediate practical reward. The researchers concluded that the behavior met established behavioral criteria for animal play, and a later chamber-choice test suggested ball rolling could be rewarding. The experiments offer evidence of play-like behavior—not proof of what bees consciously feel.
What the researchers counted as play
The study, “Do bumble bees play?”, was published in Animal Behaviour, volume 194, in December 2022, pages 239–251. The authors examined whether ball rolling was separate from immediate survival behavior, intrinsically rewarding, different in form from functional behavior, repeated without being stereotyped, and initiated in conditions intended to be stress-free. They also considered whether the bees might instead be searching for food, clearing clutter, or displaying mating behavior. Source: “Do bumble bees play?”
For an action to count, a bee had to be on top of a ball and rotate it along the floor while maintaining contact. The movement had to last at least 0.4 seconds, and the bee’s head and body axis had to align with the ball on approach. The threshold was intended to reduce the chance that accidental contact would be counted as rolling.
What happened in the experiments
The researchers recorded 910 ball-rolling actions by 45 bumble bees. Individual bees rolled between 1 and 44 times on an experimental day and between 1 and 117 times over the study. These are counts from the experiment, not estimates of how often play occurs among bee populations. Study findings
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Within the bees studied, younger individuals rolled more balls than older ones, while males rolled individual balls for longer than females. These observed patterns should not be taken as universal rules about age or sex in all bees.
The chamber-choice test
In a separate test, bees later preferred the color associated with a chamber where they had rolled balls. The authors interpreted that preference as evidence that ball rolling could be rewarding. It supports the play interpretation, but does not establish a particular conscious experience.
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Why the study was described as evidence of insect play
The authors’ abstract says: “Here, we show that rolling of wooden balls by bumble bees, Bombus terrestris, fulfils behavioural criteria for animal play and is akin to play in other animals.” Their conclusion rests on observable behavior assessed against stated criteria, together with findings consistent with reward. The University of Oulu described the work as the first time object play had been shown in an insect; that “first” claim is an institutional description of this study, not evidence that all insects play. Study abstract University of Oulu summary
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the findings cannot tell us
Behavioral evidence can support an interpretation of play without revealing what an animal subjectively experiences. The experiments do not show that bees feel fun in a human-like way or prove a particular conscious state.
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The researchers gave the bees free access to food and movement as measures intended to limit stress. They nevertheless said they could not rule out the possibility that captive bees rolled balls after lacking stimulation they might otherwise encounter in a natural environment. The findings therefore apply to the studied captive Bombus terrestris and do not establish that every bee plays. Study discussion of interpretation and limits
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