“Blue moon,
You saw me standing alone
Without a dream in my heart
Without a love of my own.”
–Frank Sinatra, First Verse
Graceful Blue Moon (Hypolimnas bolina) butterflies dance in our garden with elegant dress here in Tonga in the South Pacific. Males all appear the same. However, the females are not only dimorphic (featuring different colors and patterns from the opposite sex), but also rarely look the same as other females, demonstrated by this photo essay.
With wings folded, this photo shows the male Blue Moon’s ventral view, the underside of its wings. As with most butterflies, its wings at rest are not nearly as showy as the dorsal or topside wings shown in the next photo, Blue Moon males are extremely territorially and will chase away other butterflies, even those larger than themselves.
Behold this gorgeous, velvety male Blue Moon butterfly, also known as Great Eggfly. I reared this one and dozens of others like him from caterpillars discovered growing on roadside weeds here in Tonga. The upper side of the wings of the male Blue Moons is jet black, offset with three pairs of white spots: two on the forewing and one on the hindwing. These spots are surrounded by purple iridescence that only appears when the light source is at the correct angle.
The female Blue Moon butterfly has several different colorations. I’ve raised at least 20 females and each one has had different markings. The wings remind me of the colors and patterns of tapa cloth found in Tonga and in other parts of Polynesia. In fact, we’ve started referring to the female Blue Moon butterfly as the Tapa Cloth butterfly. I suppose that’s how butterflies get their common names.
This is a typical piece of finished tapa cloth or ngatu (pronounced NAH-too) in Tongan. Tapa cloth is made from the inner bark of the Mulberry (Broussonetia papyrifera) tree that is pounded thin and glued together with vegetable starch, usually from kumala (sweet potato) or manioke (cassava), then painted with traditional designs. Just as each work of tapa cloth is different and reflects talents of the artist, female Blue Moon butterflies seem to flaunt their own unique styles. • Photo courtesy of the Virtual Collection of Asian Masterpieces
Another beautiful female Blue Moon butterfly with its own distinct pattern. For many months after moving to Tonga, we thought that we were seeing a multitude of different butterfly species nectaring on the flowers in our yard until I reared these and saw for myself that they are all female morphs of the same species.
Here’s yet another gorgeous female Blue Moon butterfly ready to be released into the wild. Her colors resemble the tapa cloth on the left in the next photo.
Two long tapa cloths of approximately 60 linear feet (18.28 meters), each with its own patterns and earth-tone colors, just like the different female Blue Moon butterflies. I took this photo this year near Vaini on the main Tongan island of Tongatapu. The owner had placed them in the sun for the day to air them out. He was rightfully proud of his ngatu collection. Tapa cloths hold great value in Tonga, both monetary and sentimental, and are used ceremonially on special occasions. They are also given at graduations, weddings and funerals; and passed down as family heirlooms from generation-to-generation. Read more about tapa cloth in Wikipedia.
This is one of my husband’s favorite female Blue Moon patterns. You can really start to imagine nature painting her wings the way Tongan women paint tapa cloth.
The female Blue Moon butterfly hovers over a plant to check for ants which might eat her eggs. After selecting a plant which has no ants on it, she lays at least one but often two to five eggs on the undersides of the leaves.
For months, we could not figure out which of the many host plants, that Blue Moon butterflies are known to use, might be available in Tonga. Then one day, to my complete surprise, a female Blue Moon “saw me standing alone” and landed right at my feet. She deposited eggs on a nearby plant, which we later discovered was Nodeweed. Mystery solved!
Nodeweed (Synedrella nodiflora) is one of several host plants for the Blue Moon butterfly’s caterpillars. It grows wild in Tonga and can easily be found along unmowed roadsides and vacant lots.
Two well-camouflaged green Blue Moon butterfly eggs hidden on the leaf’s underside.
Blue Moon caterpillars are black and covered with prickly orange spines that deter predators (and handling by humans).
Blue Moon chrysalises are brown with spines and well camouflaged. Adult Blue Moon butterflies eclose (emerge) about ten days after pupating.
Blue Moon butterflies are found from Madagascar, off the southeast coast of Africa, through South and Southeast Asia, to South Pacific islands (including French Polynesia, Tonga, Tuvalu, Samoa, and Vanuatu), and in parts of Australia, Japan, and New Zealand.
If you live in or happen to visit their range, keep an eye out for the snazzily-dressed males in their velvety black tuxedos with iridescent purple cummerbunds and the females styling their myriad elegant tapa-cloth formals. Two ladies never want to wear the same dress to the ball.
“Blue moon,
Now I’m no longer alone
Without a dream in my heart
Without a love of my own.”
–Frank Sinatra, Chorus
