Ceylon Hedge Blue (Udara lanka)

The Ceylon Hedge Blue (Udara lanka) is one of Sri Lanka's most distinctive endemic butterflies — a small, delicate species that few visitors ever notice despite its quiet presence in the island's forested highlands. Belonging to the family Lycaenidae, a group collectively known as the "blues" for the characteristic colouring found across many of its members, Udara lanka is found nowhere else on Earth.

What does the Ceylon Hedge Blue look like?

At first glance the Ceylon Hedge Blue could be mistaken for any number of small Lycaenid butterflies, but a closer look reveals a combination of features that sets it apart. The wingspan is small, consistent with others in the Lycaenidae family, and the body is slender and lightly built.

• Upper surface: A soft bluish-purple, often carrying a subtle iridescence that shifts slightly depending on the angle of light.
• Under surface: Pale grayish-white, marked with fine dark spots and streaks that provide effective camouflage against bark and leaf litter.
• Hindwings: Rounded and tail-less — a useful distinguishing feature compared with some other Lycaenid species that carry fine hair-like tails.

The combination of a shimmering dorsal surface and a cryptic underside is a common Lycaenid strategy: conspicuous in flight to attract mates, near-invisible at rest to avoid predators.

Where is the Ceylon Hedge Blue found in Sri Lanka?

This species is confined to Sri Lanka's wet zone, with sightings concentrated in shaded mid-elevation and highland forests. It tends to favour cool, humid environments where the canopy is dense enough to keep the understorey sheltered from direct sun. The Sinharaja Forest Reserve, a UNESCO World Heritage Site, represents one of the most ecologically intact wet-zone habitats remaining in the country and is among the best areas in which endemic forest-dependent species such as this can still be reliably encountered.

Highland areas and the fringes of montane forests — including the landscapes around Horton Plains National Park — also fall within the broader range attributed to wet-zone specialists. Udara lanka is not a species of open gardens or roadside scrub; it requires intact or near-intact forest.

Why is Udara lanka considered rare?

Rarity in butterflies is not always a single-cause problem. In the case of the Ceylon Hedge Blue, the combination of a very restricted geographic range (Sri Lanka only), habitat specificity (wet-zone forest interior), and the ongoing pressures of deforestation and climate-driven shifts in highland microclimates all contribute to its vulnerable status. It is not a species that adapts easily to degraded or fragmented forest.

Because it is endemic — biologically unique to this island — any local extinction would be a global one. That makes conservation of Sri Lanka's remaining wet-zone forests directly relevant to the survival of this butterfly.

What is the lifecycle and behaviour of the Ceylon Hedge Blue?

Like all Lycaenids, Udara lanka passes through four life stages: egg, larva (caterpillar), pupa (chrysalis), and adult. The larvae of many species in this family are associated with specific host plants, often feeding on flower buds or young leaves rather than mature foliage, and many share a mutualistic relationship with ants — the larvae produce secretions that ants harvest, while the ants in return offer some degree of protection. Whether Udara lanka exhibits this ant-association fully is an area where field research in Sri Lanka remains relatively limited.

Adult butterflies are most active during the cooler parts of the day in their shaded forest habitats. Flight is typically low and unhurried, which — combined with the cryptic underside of the wings — makes them easy to overlook unless you are actively watching for movement among leaf litter and low vegetation.

How does the Ceylon Hedge Blue fit into Sri Lanka's wider butterfly diversity?

Sri Lanka hosts around 245 recorded butterfly species, of which a notable proportion are endemic or near-endemic — a reflection of the island's long geographic isolation and the extraordinary biodiversity of its wet-zone forests. The Lycaenidae family is particularly well represented, with several species that occur nowhere else.

The island's butterfly fauna is closely connected to plant diversity. Forests such as Sinharaja contain hundreds of endemic plant species, many of which serve as larval host plants or adult nectar sources for specialised butterflies. This web of interdependency means that butterfly conservation and forest conservation are effectively the same cause.

For visitors interested in Sri Lanka's natural history more broadly, the cloud forest habitats of the central highlands offer some of the richest encounters with endemic flora and fauna in the country.

When is the best time to look for the Ceylon Hedge Blue?

Butterfly activity in Sri Lanka's wet zone is generally highest during the inter-monsoon periods — typically around March to April and again in October to November — when temperatures are moderate and there is neither the full force of the monsoon nor the dry-season heat. Within wet-zone forests, the relatively stable humidity means some butterfly species can be found year-round, though abundance and flight frequency tend to peak during these transition months.

Morning hours, before the midday heat, are generally the most productive time for observation. Carrying a pair of close-focus binoculars significantly improves the experience with small Lycaenid species.

Can I see this butterfly on a Lakpura tour?

The Ceylon Hedge Blue is not a species that can be reliably scheduled into an itinerary — that honesty is worth stating clearly. However, nature-focused visits to Sri Lanka's wet-zone forests, particularly Sinharaja, give genuinely good opportunities to encounter endemic Lycaenids including this species. Lakpura can arrange guided forest walks with naturalists who know where to look and how to identify what they find. A broader Sri Lanka nature tour routed through the highlands and wet zone will pass through the right habitats.