Heliconius sara (Sara longwing) ranges from Mexico through Central America to the Amazon Basin and southeastern Brazil. Its narrow black wings carry pale forewing bands and an iridescent blue patch across the hindwings, a pattern that can shift with viewing angle. It inhabits humid forest edges, clearings, and river margins where adults can move between flowers and passionflower host vines.

Females use particular passionflowers for egg laying, including Passiflora auriculata in studied populations. Caterpillars feed together when young and obtain chemical protection associated with their host. Adults collect both nectar and pollen and may live for several months. At dusk they assemble in communal roosts, often returning to the same leaves and branches on successive nights. Photographed in Colombia.