A team of entomologists from the University of Bristol and the Smithsonian Tropical Research Institute has gathered decades of data from butterfly nests, field studies, and laboratory experiments to create the most comprehensive overview of the Heliconius butterfly. Found throughout Central and South America, this colorful species exhibits remarkably slow aging, with lifespans that can increase by approximately three times. Notably, close relatives, such as Heliconius Hewitsoni, have been recorded living up to 348 days in captivity.
The Heliconius genus includes vibrant butterflies found in tropical and subtropical areas of Central and South America, with some ranging into the southern United States.
Commonly referred to as “longwings,” these butterflies are noted for their elongated wings.
Unlike most butterflies that primarily consume nectar, Heliconius butterflies uniquely integrate pollen into their nectar diet, using their proboscis to collect pollen and extracting essential amino acids with saliva.
This innovative feeding behavior was first documented by evolutionary biologist Lawrence Gilbert in 1972.
The additional amino acids are believed to contribute to remarkable traits such as extended lifespan, continuous egg production, and enhanced chemical defenses.
Many Heliconius species can live for several months in the wild, significantly outlasting closely related butterflies in the broader Heliconiini tribe, which typically survive only about six weeks.
While the exact factors contributing to their incredible longevity are not fully understood, it is hypothesized that maintaining a pollen-rich diet into adulthood may be influential.
“Insects represent the most species-rich animal group, showcasing extraordinary morphological and ecological diversity,” says Dr. Jessica Foley from the University of Bristol.
“Lifespan variation is extreme, with maximum lifespans ranging from just a few days in adult mayflies to decades in reproductive castes of certain ants and termites.”
This results in a 5,000-fold difference within the class, as opposed to the 100-fold difference seen in mammals.
“Heliconius butterflies are notable not only for their longevity but also for their slower aging process,” Dr. Foley notes.
“This allows them to outlive their evolutionary relatives, who diverged more recently.”
In a new study, Dr. Foley and her team found that the unique pollen-based diet of Heliconius extends lifespan, but surprisingly, even when deprived of pollen in experiments, these butterflies lived about three weeks longer than their shorter-lived relatives.
This suggests evolved genetic changes in their biology, indicating that their unique longevity stems from more than just dietary benefits.
To explore the underlying mechanisms, researchers measured not only survival duration but also how physiological conditions change with age.
Using grip strength as a measure of physical condition, findings revealed that closely related species like Dorias Julia lost about a quarter of their grip strength within five weeks, while Heliconius Hekale showed no measurable decline in grip strength over a significantly longer lifespan.
The lifespan difference between these groups is a remarkable 25-fold, one of the largest recorded for closely related animals, rivaled only by certain fish species.
Insects are prime candidates for identifying mutations associated with longevity due to their brief lifespans, allowing for practical long-term studies that would take decades in mammals.
Scientists are optimistic that Heliconius butterflies will serve as a new model organism in aging research, as their rich genomic data facilitate studies of molecular mechanisms behind “extended healthspan.”
“Exploring lifespan extension in Heliconius provides an exceptional opportunity to understand the biological mechanisms of longevity,” said Dr. Foley.
“Comparing long-lived Heliconius butterflies with their short-lived relatives creates a natural evolutionary experiment that may illuminate how lifespans can be extended, making it a promising model for aging biology.”
The team’s findings are published in the journal Nature Communications.
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J. Foley et al. 2026. Evolution of longevity and slowing of aging in a genus of tropical butterflies. Nat Commune 17, 5077; doi: 10.1038/s41467-026-73635-7
Source: www.sci.news
