territorial | Butterfly Lady

Life on a remote island in the South Pacific brims with quirky surprises. We learn to expect most anything.

While driving to town, the random pig will dash in front of the car, causing us to slam on brakes. Sometimes, it’s a dozen pigs, or a pair of dogs, or a clutch of chickens; or a child, who seems to delight in the cheap thrill of racing across the road and living to laugh about it.

I live in Nuku‘alofa on the island of Tongatapu in the Kingdom of Tonga, which is 1,240 miles (1,997 kilometers) northeast of Auckland, New Zealand. A few days ago, a white Monarch butterfly (Danaus plexippus nivosus) found the Tropical Milkweed (Asclepias curassavica) in my yard and began laying eggs.

A female white-form Monarch butterfly nectaring in Tonga on flowers of Tropical Milkweed, which also happens to be her host plant for egg laying.

I thought her wings were just old, worn, and faded, as butterflies can get as they age. But, on closer inspection, I realized that she was actually white in the places where she should have been orange. We have Monarch butterflies here in Tonga (read more here), but this is the first white Monarch that I’ve observed anywhere.

According to Monarch Watch, white Monarchs have been found throughout the world, including in Australia, New Zealand, Indonesia, the Hawai‘ian islands and on the mainland of the United States. Generally, white Monarchs are extremely rare with only a few being reported each year. The exception is in Hawai‘i where it is believed that as much as 10% of the population of Monarchs is white.

Monarchs are preyed upon by birds called Red-Vented Bulbuls (Pycnonotus cafer), which are quite abundant here on our island, as well as in Hawai‘i. Red-vented Bulbuls come from Southeast Asia and are relative newcomers to the islands of Polynesia.

Scientists suggest that predation is lower for white Monarchs and raise the possibility that the white form is more cryptic (harder to see) for the Bulbuls than the orange form. Consequently, they eat more regular, orange-form Monarchs than white-form specimens, increasing the relative frequency of the latter in places where both white-form Monarchs and Bulbuls range.

As I attempted to get a photo of the white Monarch, a huge Wasp (Hymenoptera apocrita spp.) was flying around which made me nervous, and an aggressive male Blue Moon butterfly (Hypolimnas bolina) kept chasing her away as he displayed his natural territorial tendencies. I realized it was going to be impossible to get a good photograph. So I caught her with my butterfly net and placed her inside a pop-up cage with some Milkweed (Asclepias spp.).

After an overnight stay for observation, I released the white Monarch the next morning. She left me many eggs on the Milkweed in the cage, even laying on the screen, so I thanked her and set her free.

To my surprise and delight, she lingered all day in the garden and continued to come back, time and again, to nectar on the flowers and deposit eggs on the outside Milkweed. I sat on the porch and enjoyed watching her glide gracefully through the air as she flew back and forth in my yard.

Some cultures believe that a white butterfly brings good fortune. I don’t know about any fortune. However, the visit of this beautiful white Monarch brought me great joy and surprise. For that, I’m rich.

“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.