Most butterflies flit through life in a matter of weeks. The tropical longwings of the genus Heliconius are a striking exception — and scientists now think they could teach us something about ageing itself.
In research published in Nature Communications on 16 June 2026, a team led by the University of Bristol found that Heliconius hewitsoni survived up to 348 days in their study, while one of its short-lived relatives, Dione juno, lasted just 14 — a roughly 25-fold gap in lifespan between cousins.
More remarkable still, at least one species, Heliconius hecale, showed little or no physical decline as it aged: a grip-strength test detected no clear deterioration in older individuals.
The leading clue is diet. Heliconius are the only butterflies known to feed on pollen as adults, a protein-rich habit linked to their long lives. But the extended lifespan persisted even without pollen, suggesting evolution has also rewired the insects internally. Researchers hope a closer look could surface longevity lessons that apply, one day, to humans.
Sources: ScienceDaily · Nature Communications · University of Bristol · CNN
