Eastern Tailed Blue Butterfly: Identification, Life Cycle, and Behavior

Discover the world of the Eastern Tailed Blue Butterfly, a remarkable species known for its unique behaviors and beautiful appearance.

This guide will provide you with all the necessary information from identification to lifecycle and diet.

Get ready to step into their vibrant world and learn about the threats faced by this fascinating insect.

Eastern Tailed-Blue butterfly

What is the Classification of Eastern Tailed Blue Butterfly?

The Eastern Tailed Blue Butterfly, scientifically named ‘Cupido comyntas‘, finds its place in the Animalia kingdom. Under that, it belongs to the ‘Arthropoda‘ phylum, representing invertebrates with an exoskeleton.

This beautiful creature falls into the ‘Insecta‘ class, which includes insects like beetles, bees, and ants.

Its order, ‘Lepidoptera‘, exclusively hosts moths and butterflies. Catering to its unique characteristics, it is classified under the ‘Lycaenidae‘ family.

This family includes the gossamer-winged butterflies, known for their vibrant, iridescent wing patterns.

Further drilled down to the genus level, the Eastern Tailed Blue Butterfly belongs to ‘Cupido‘. It shares this space with other related species like Dwarf Blue or Small Blue butterflies.

Keeping up with its uniqueness, the Eastern Tailed Blue Butterfly has its own species, and that is ‘comyntas‘. This unique classification sets it apart from its vibrant and diverse butterfly counterparts.

What is the Distribution of Eastern Tailed Blue Butterfly?

The Eastern Tailed-Blue Butterfly, scientifically known as Cupido comyntas, boasts a wide distribution across North America.

Astonishingly, they span across the United States from Maine to Florida, west to eastern Washington and eastern Oregon, and in Southwestern Canada.

You can often find these small blue beauties in meadows, roadsides, or disturbed sites where individuals of the Fabaceae family, their favorite food plants, thrive.

In essence, their distribution stretches from sea to shining sea. The expansiveness of their territory is quite remarkable and reveals the resilience of this small insect.

Adaptability is the key, shaping them into a species that can handle varying climates and geographical conditions. Notably, their spread also extends to parts of Central America, more shading the versatility of their survival skills.

Contrary to many species, changing seasons seem not to bother the Eastern Tailed-Blue. Throughout the year, they can hatch multiple generations depending on the region.

In the southern range, you might witness as many as four generations per year. However, are usually two generations per year in the northern range.

In conclusion, the Eastern Tailed-Blue butterfly is quite a wandering kind, demonstrating a large range across North America.

Their ability to adapt and manage in different regions and climates renders them among the most widespread butterflies in North America.

What are the Main Characteristics of the Eastern Tailed Blue Butterfly?

The Eastern Tailed Blue Butterfly (Cupido comyntas) is a fascinating little creature. Its wingspan measures in at only 0.9 to 1.1 inches (2.2 to 2.8 cm), making it small but captivating.

Often, you’ll see the males flaunting a bright blue color, while the females are more of a dull gray to blue shade.

  • Look closer at their wings and see exquisite details. The tailed blue’s wings possess a row of tiny orange spots just above the marginal row of black dots on the underside. These intricate patterns combine to create a stunning tableau on the creature’s wings.
  • Another noteworthy trait is its ‘tail’. The eastern tailed blue displays a small threadlike tail on each hind wing resembling antennae.
  • Did you know this butterfly has a swift, erratic flight style, making it full of surprises?
  • Furthermore, they’re known to ‘puddle’, congregating around mud puddles to draw up vital minerals and salts.

The Eastern Tailed Blue certainly proves that beauty comes in all sizes! Each detail contributes to the overall allure of this species, making it a much-admired figure in the butterfly world.

In your next butterfly spotting adventure, be sure to keep an eye out for these small but impressive insects.

How to Identify Male and Female Eastern Tailed Blue Butterfly?

Identifying the Eastern Tailed Blue Butterfly male and female is simple once you are aware of the distinct differences.

The males are recognizable by their vibrant blue upper wing surfaces that glisten in the sunlight. Contrastingly, females don’t match the males’ intense blue.

Instead, they show off grayish-blue or brown color on the same surface. While flying, these coloristics are less noticeable as both genders exhibit a similar light grey color on their underwings that’s interspersed with black, orange, and white spots.

The distinguishing features also lay in the size of the butterflies. In general, you will find that males are slightly smaller, measuring from 0.75 to 1 inch (1.9 to 2.5 cm) across.

The females of the species, however, range in size typically from 1 to 1.2 inches (2.5 to 3 cm).

Ready for some exciting facts? The name “Tailed Blue” comes from the distinctive small, thread-like tail extensions observed on their hind wings.

But here’s a quick tip for identification – only females of the species feature these extensions. With these guidelines in mind, you can easily identify whether the pretty Eastern Tailed Blue that caught your eye is a male or female!

What is the Mating Ritual of Eastern Tailed Blue Butterfly?

The mating ritual of the Eastern Tailed Blue butterfly is a fascinating dance of nature. The males initiate the courtship. They seek out and fly close to receptive females.

The male butterfly will then ascend some 30 to 90 cm (or 1 to 3 feet) above the female and begins what is known as a courtship flight.

This consists of fluttering wings and random movements around her. During this time, the male also discharges pheromones to attract and entice the female.

If the female is responsive, a unique behavior is displayed. She will close her wings and remain motionless, signaling her acceptance of his advances.

This unique, silent communication is the green light for copulation.

Following mating, the female embarks on an egg-laying mission. This is an independent venture, as the males do not participate in the rearing process of caterpillars.

The females seek out appropriate host plants to lay their eggs, signaling the completion of their mating ritual.

Here’s the mating ritual summary in bullet points:

  • Mating initiation: Male locates a receptive female and flies near her.
  • Courtship flight: Male ascends above the female and creates an enchanting fluttering dance, discharging pheromones to attract her.
  • Female acceptance: The female closes her wings and remains still, signaling interest.
  • Copulation: Mating occurs following the female’s acceptance.
  • Egg-lay mission: Post mating, the female seeks a suitable host plant to lay eggs, officially completing their mating ritual.

Through this, the Eastern Tailed Blue butterfly continues its lifecycle, engaging in a natural mating dance that enlightens those lucky enough to witness it.

What Does the Caterpillar of Eastern Tailed Blue Butterfly Look Like?

The Eastern Tailed Blue Butterfly caterpillar is a sight to behold. It’s a small critter, growing only up to a maximum of 1 inch (2.54 cm) in length.

Donned in various shades of green, these caterpillars blend seamlessly with their primary hosts, legumes, during their growth period.

In terms of body structure, the caterpillar is somewhat cylindrical. It possesses a bold white patch down its back, akin to a racing strip.

The body is covered in fine hairs or bristles, providing a slightly fuzzy appearance. With a subtly tapering head, the Eastern Tailed Blue Butterfly caterpillar possesses a unique charm.

Check out the distinguishing features:

  • Size: Up to 1 inch (2.54 cm) long.
  • Color: Predominantly green.
  • Markings: Bold white patch down its back.
  • Body: Cylindrical and subtly tapered at the head.
  • Texture: Covered in fine hairs or bristles.

These features put together form a remarkable visual identity for the Eastern Tailed Blue Butterfly caterpillar.

So, when you are out in the greens next time, keep an eye out for these tiny wonders. You never know when you might spot one!

What is the Life Cycle of Eastern Tailed Blue Butterfly?

Eastern Tailed Blue Butterflies begin their life as an egg. During this stage, the eggs are laid on the under side of leaves.

They’re a pale green color and about the size of a pinhead. After two to five days, the eggs hatch into larvae, a stage often referred to as the caterpillar.

Eastern Tailed Blue Caterpillars are light green with a white stripe running down each side, and they have tiny, black bristles covering their bodies.

They feed ravenously on the leaves where they were hatched, growing and shedding their skin several times over a period of two weeks.

When they’re ready, the caterpillars attach themselves firmly to a stem or leaf. Their body cells reorganize to form a chrysalis.

Inside this pupa, the caterpillar will undergo a breathtaking transformation. After about seven to eleven days, a transformed adult butterfly emerges.

The adult Eastern Tailed Blue Butterfly has a wingspan of 0.75 to 1.25 inches (19-32mm). Adults normally live for about one week, but the final generation of the year hibernates during the winter as adults and can live up to 9 months.

They feed on nectar, adding an essential role as pollinators to their life cycle.

What Is the Average Life Expectancy of an Eastern Tailed Blue Butterfly?

Understanding the lifespan of the Eastern Tailed Blue Butterfly, scientifically named Cupido comyntas, is fascinating.

A single generation of these butterflies, emerging as adults, live a hectic but short life, averaging about a week to two weeks. The larvae, or caterpillars, live slightly longer, with an average lifespan of two weeks to a month.

Perhaps surprising, it’s the pupae (chrysalis stage) that has the longest span of life. When the caterpillar forms its chrysalis in preparation for metamorphosis, it can remain in this state for up to nine months over the winter.

This dormancy, known as hibernation, is a strategy for survival.

Accumulating these stages, we can estimate that the total lifespan of an Eastern Tailed Blue Butterfly, from egg to adult, is generally between 9.5 to 10 months.

But remember, only a small portion of this is spent fluttering in the sunshine.

Remember that these life spans are averages and can be influenced by conditions such as temperature, food availability, and predator presence.

There’s a simultanious beauty and fragility to their existence, a balance between nature’s tempo and environmental pressures.

This fleeting life span of the Eastern Tailed Blue, compact yet filled with stages of transformation, can remind us to appreciate their presence while we can.

What Does the Diet of an Eastern Tailed Blue Butterfly Consist Of?

Just like many other butterflies, the Eastern Tailed Blue Butterfly thrives upon the nectar of different flowering plants. This forms the primary diet for these blue butterflies.

Flowers like legumes, dogbane, and milkweeds serve as a source of nutrition for them.

Nectar gives them necessary sugar for energy, amino acids for protein, and other nutrients like minerals and vitamins.

They savor their food using a proboscis, a siphoning mouthpart, perfect for dipping into flowers and enjoying the nectar.

Apart from the nectar, Eastern Tailed Blue Butterflies show a tendency towards mud-puddling. They’re often found on damp ground, sipping from moisture and mud puddles.

This unusual diet addition is essentially for traction of minerals, particularly salts and amino acids which are scarce in flower nectar.

Don’t be alarmed if you find them clustered around animal waste as they are scavengers, too. They tend to consume waste, decaying fruits or any decomposing plant matter for additional nutrients.

This behavior helps them to access more diverse nutrients than their diet of nectar can provide.

To sum up, the diet of Eastern Tailed Blue Butterfly is a mixed bag consisting of nectar, damp soil, and decaying plant matter.

This blend provides them with the necessary energy and nutrients, contributing to their unique charm and strength.

Which Plants Serve as the Primary Hosts for Eastern Tailed Blue Butterfly?

Most certainly, the Eastern Tailed Blue Butterfly has a range of host plants. Predominantly, their larvae are highly associated with legumes, with the butterfly’s caterpillars using these as a primary food source.

Alternately, plants from the Fabaceae family, such as clover, are chief in nursing the development of these insects.

Wild pea plants also serve a fundamental role for the Eastern Tailed Blue Butterfly, specifically the caterpillar stage.

In fact, the whole performance, right from egg-laying to the caterpillar’s development, is tremendously associated with wild pea plants.

Let’s not forget about the other host plants. These include plants like the alfalfa (Medicago sativa), white sweetclover (Melilotus albus), and hairy small-leaved tick trefoil (Desmodium ciliare). They do provide substantial support to the life cycle of the butterfly.

In summary, the Eastern Tailed Blue Butterfly is quite accommodating and can hence make use of a variety of plants.

However, it favors those from the legume family due to the high protein content which is essential for their caterpillars’ development.

This ensures that the growth of the caterpillars isn’t compromised, thus securing the butterfly’s existence.

What are the Unique Mimicry Behaviors in Eastern Tailed Blue Butterfly?

Look out for the Eastern Tailed Blue Butterfly’s ingenious mimicry behaviors. These small creatures use mimicry as part of their arsenal of survival tactics.

Specifically, the butterflies display Batesian mimicry, which is a form of deceptive imitation utilized by prey to avoid predators.

Batesian Mimicry involves the Eastern Tailed Blue Butterfly imitating the appearance of more dangerous or unappetizing species to detract potential threats.

Producing patterns and colors simulating those of unpalatable species, they effectively fool predators into thinking they would be a distasteful meal.

Female Eastern Tailed Blues up the ante by displaying sexual dimorphism. From summer into autumn, females imitate the appearance of the larger and distasteful Pipevine Swallowtail, which helps them evade risk of predation.

And there’s an interesting thing about their larvae. Eastern Tailed Blue caterpillars exhibit charm-like behavior using their dorsal nectary organ (DNO), a glandular structure.

As a result, ants are tricked into shifting their protective instincts to the caterpillars, providing the larvae with their very own ant bodyguards.

As if it’s not enough, the caterpillars also secrete a sweet substance known as honeydew that further entices their ant protectors.

In conclusion, the Eastern Tailed Blue Butterfly’s survival can be largely attributed to their unique mimicry behaviors.

These clever tactics allow them an edge on survival, making them not only distinctive, but fascinating creatures to observe.

What Are the Main Threats to Eastern Tailed Blue Butterfly Populations?

Like many butterfly species, the Eastern Tailed Blue Butterfly faces a host of challenges and threats to its survival. Most of these threats are unfortunately a product of human activities.

Habitat loss and degradation tops the list. As we tirelessly expand our urban footprints and agricultural lands, their natural habitats are shrinking.

Forests and meadows they call home are disappearing, leaving them with fewer places to breed, feed, and hibernate.

Pesticide use also poses a significant risk. Agricultural and domestic use of insecticides, herbicides, and fungicides destroys the vast array of plants that these butterflies, particularly their caterpillars, rely on.

These chemicals can also directly harm the butterflies themselves, reducing their populations significantly.

The effects of climate change are another major threat. Rising temperatures can unravel the complex timing between the emergence of the butterflies and the blooming of their host plants.

Droughts, floods, and extreme weather events brought on by climate change also destroy their habitats.

Lastly, invasive species and diseases can wipe out entire populations of these butterflies. Non-native plants may replace their host plants.

Moreover, pathogens and parasites introduced to their habitats can also harm their lifecycle.

It is of paramount importance to realize the impact of our actions. As the threats mentioned above are mainly consequences of our activities, we do hold the power to mitigate these risks and keep these captivating butterflies adorning our skies.


In conclusion, the Eastern Tailed Blue Butterfly is an impressive creature, owing to its unique life cycle, diet, mating rituals and remarkable adaptation tactics.

Armed with this profound knowledge, you see this beautiful butterfly again, you would perceive beyond its aesthetic allure.

Please feel free to leave a comment and share your experiences or findings about this intriguing species.

Butterflies   Updated: September 19, 2023
avatar Welcome to Insectic, a blog to learn about insects and bugs. I'm Richard, and I've created this website to share my experience, knowledge, and passion with others.

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