Weaver ants generate significantly more pulling force when cooperating in groups to bend leaves and construct multi-level nests [1, 2].
This discovery challenges the Ringelmann effect, a classic theory suggesting that individual productivity decreases as team size increases. By demonstrating "superefficient" teamwork, these insects provide a biological blueprint that could revolutionize the development of swarm-robotics systems [1, 2].
The research, published in Current Biology on Aug. 12, 2025, focused on three species of weaver ants across two continents [1]. These ants, found from the African tropics to South Pacific islands, were studied in U.S. laboratory settings to determine how they manipulate their environment [1, 2].
Data shows that a single weaver ant can exert approximately 0.5 mN of pulling force on a leaf [1]. However, the strength of the group grows disproportionately. Dr. Luis Gomez, a co-author of the study, said the leaf-bending force of a 10-ant chain was three times that of a single ant [2].
This ability allows the ants to pull large, rigid leaves together to create the structural foundations of their nests. The cooperative mechanism ensures that the collective output exceeds the simple sum of individual efforts, a rarity in many animal and human social structures.
"Our findings show that ants become stronger as a group, overturning the classic Ringelmann effect," said Dr. Anjali Patel, the lead author of the study [1].
Beyond biology, the findings have immediate implications for engineering. Prof. Mark Liu, a robotics expert, said these ants could inspire new algorithms for swarm robotics [2]. By mimicking the way weaver ants coordinate their pulling force, engineers may create robot swarms capable of moving heavy objects with minimal energy and high precision.
“"Our findings show that ants become stronger as a group, overturning the classic Ringelmann effect,"”
The ability of weaver ants to overcome the Ringelmann effect suggests that specific social coordination can negate the typical loss of efficiency found in larger groups. For the field of robotics, this means shifting from simple additive models of strength to cooperative models where the group's total output is amplified through synergy, potentially allowing small robots to perform heavy-duty industrial tasks.
