Surendra vivarna
In 3 days ~20% in a week ~40%
Surendra vivarna, the acacia blue, is a species of lycaenid or hairstreak butterfly found in Sri Lanka, India and the Indonesian islands as far as Sulawesi. Its range is similar to that of its genus, Surendra, except it is not recorded from China or the Philippines proper (where it is replaced by S. maniliana), but from Balabac, Palawan and the Calamian Islands.
Upperside: both wings rather intense deep blue: primaries with the costa broadly, posterior margin more broadly, apex still more broadly black; secondaries with the blue limited to just over the median area, the rest of the wings black. Tails two, black, the longer one white-tipped. Underside : both wings very dark greyish brown: primaries with an obscure dark dot near the centre of the cell and a small dash closing it, costa with three dark dots; transverse blackish line curved irregularly and scalloped from the costa to the submedian nervure, a submarginal row of blackish dots, margin obscurely dark, internal area quite pale: secondaries with a small white spot about one-third along the costal nervure, below which is an obscure dark short dash in the cell; from two-thirds along the costa to the... Wikipedia →
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report an Acacia Blue sighting in Singapore on a given day, based on 110 verified sightings from GBIF citizen-science data. It is the 218th most-seen of the 1045 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June–July and September–April
In those months about 10% of wildlife watchers report an Acacia Blue in Singapore on a given day, against under 5% in May and August, the lowest months.
Among the best
Of the 2 cities where we can rate Acacia Blue sightings, Singapore ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Jakarta (Indonesia, about 10%).
Same family: Lycaenidae
The closest relatives of the Acacia Blue that you can see in Singapore (family Lycaenidae, Gossamer-winged Butterflies) are Branded Imperial (about 20%), Lesser Grass Blue (about 20%) and Tiny Grass Blue (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Acacia Blue is recorded against all the insects logged in Singapore (110 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
