A University of Bristol-led study reports that some Heliconius butterflies are among the longest-lived butterflies documented, with one individual recorded living 348 days, and that at least one species shows little measurable loss of muscle performance with age.
The research, published June 16, 2026 in Nature Communications, compared longevity and ageing patterns across the Heliconiini tribe—passion-vine butterflies found across the rainforests of Central and South America.
The study compiled lifespan records from published field research and additional observations from commercial butterfly houses, finding a wide spread in maximum lifespans across the group. One of the most extreme cases involved Heliconius hewitsoni, with a recorded maximum lifespan of 348 days, compared with 14 days for the closely related Dione juno.
To assess physical performance with age, the researchers used a grip-strength test. They report that older Heliconius hecale individuals performed similarly to younger ones—showing little or no measurable decline—while Dryas iulia, a close relative with a shorter lifespan, showed a clearer age-related drop in performance.
The team also tested the role of Heliconius’ unusual adult pollen feeding, long suspected to support its long life. Removing pollen reduced longevity, but the study reports that H. hecale still outlived D. iulia even without pollen, suggesting that nutrition is only part of the explanation and that evolutionary changes also contribute.
In a statement released with the findings, lead author Jessica Foley said the contrast between long-lived Heliconius species and their shorter-lived relatives offers a “natural evolutionary experiment” that could help researchers identify biological mechanisms linked to longer life and healthier ageing.