Tiny ant brains with 60,000 neurons reveal evolution of parental care from feeding circuits

On July 8, 2026, researchers from Rockefeller University published a groundbreaking study in Nature revealing how parental care evolved in ants through the repurposing of ancient feeding circuits. This research highlights the role of neuropeptides in modulating caregiving behaviors, offering insights into the evolution of parenting across species.

Understanding Ant Parental Care

Ants, particularly clonal raider ants, exhibit surprisingly advanced parental behaviors, nurturing their larvae with care. Previous theories suggested that these behaviors evolved from neglectful ancestors, but this study indicates that evolution may have repurposed existing neural systems to foster caregiving. Daniel Kronauer, head of the Laboratory of Social Evolution and Behavior, emphasizes that “evolution seldom invents things from scratch.”

By utilizing the ant’s relatively simple brain, which contains only 60,000 neurons compared to the 100 million in mice, researchers aim to uncover the neural circuitry behind caregiving behaviors more efficiently. The study identified key neuropeptides that influence how ants respond to their larvae, demonstrating a connection between hunger regulation and parental care.

Neuropeptides and Their Role in Caregiving

The researchers identified two crucial neuropeptides: Neuropeptide F (NPF), which promotes caregiving, and Allatostatin A (AstA), which encourages foraging behaviors. Young ants showed higher levels of NPF and lower levels of AstA, while older ants displayed the opposite pattern. This shift aligns with their transition from caregiving to foraging as they age.

Experiments revealed that manipulating these neuropeptides directly affected the ants’ behaviors. When ants were starved, NPF levels increased, causing them to behave like caregivers despite their hunger, while well-fed ants shifted towards foraging. This demonstrates a fascinating link between hunger and caregiving behaviors.

Implications for Understanding Parenting Evolution

This study’s findings could provide valuable insights into how parenting evolved not just in ants but also in mammals. The overlap in neuropeptide functions between ants and mammals suggests that similar biological strategies for caregiving may exist across the animal kingdom. Researchers are now focused on mapping the neural circuits influenced by these neuropeptides to further understand the evolution of parental behaviors.

As scientists continue to explore the intricacies of ant behavior, the implications of this research extend beyond entomology, potentially reshaping our understanding of the biological foundations of parenting in a broader evolutionary context.