The blue moon butterfly (Hypolimnas bolina) is a species of dark butterfly with a wingspan of about 70–85 millimeters (2.8–3.3 in). It's also known as the great eggfly, common eggfly, and varied eggfly.
The blue moon butterfly is found in 20 different subspecies in several countries, including: Madagascar, Asia, New Zealand, Australia.
The name "blue moon butterfly" comes from the males, which have black wings with three pairs of bright white spots encircled by blue iridescence. The females can vary in color.
The blue moon butterfly is territorial, and the males chase the females during spring and summer, their mating season. The best time to watch them is during this season.
The blue moon butterfly lays at least one but often two to five eggs on the undersides of leaves. It selects plants that have no ants on them.
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