Earias insulana
In 3 days ~20% in a week ~40%
Earias insulana, the Egyptian stemborer, Egyptian bollworm, spiny bollworm or cotton spotted bollworm, is a moth of the family Nolidae. The species was first described by Jean Baptiste Boisduval in 1833. It is found in most of Africa, southern Europe, the Near East and Middle East, Japan, Taiwan, the Philippines, Australia and Hawaii. It is a rare in immigrant in Great Britain.
The wingspan is 20–22 mm. Full-grown larvae are 13–18 mm long and their wingspan is generally about 24–28 mm. It can be confused with the cream-bordered green pea (Earias clorana) or the spiny bollworm (Earias biplaga). Pupation takes place in a felt-like cocoon, which is attached to dry leaves of the food plant or to plant debris on the ground. Typically, the pupal stage takes 9–15 days, but may extend to up to two months if development is delayed by low temperatures. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 2 | Kruger National Park | 🇿🇦 South Africa |
With luck
About 10% of wildlife watchers report an Egyptian Bollworm sighting in Nairobi on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 99th most-seen of the 123 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.
December
In that month about 20% of wildlife watchers report an Egyptian Bollworm in Nairobi on a given day, against under 5% in February–March, May–June and August–November, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Egyptian Bollworm sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Among the best
Of the 3 cities where we can rate Egyptian Bollworm sightings, Nairobi ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Tel Aviv (Israel, about 10%).
GBIF citizen-science records
It is estimated from how often the Egyptian Bollworm is recorded against all the insects logged in Nairobi (5 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.
