Since most butterflies live a short time, a few rare exceptions have stumped scientists. Now, some long-lived tropical butterfly species are shedding light on the secrets of longevity.
ATLANTA — Since most butterflies live a short time, fluttering between colorful flowers for a few weeks before dying, a few rare exceptions have stumped scientists. Now, some long-lived tropical butterfly species are shedding light on the secrets of ... [7112 chars]