Willema willemi
In 3 days ~10% in a week ~30%
Willema willemi, the netted sylph, is a species of butterfly in the family Hesperiidae. It is found from South Africa (Transvaal), Botswana, and Zimbabwe to Kenya, Uganda, and Somalia. The habitat consists of savanna (especially along streams fringed by trees that provide an almost closed canopy) and densely wooded clumps of bush.
The wingspan is 30–32 mm. Adults are on wing from December to May (with a peak from February to March). There is one extended generation per year. The larvae feed on Setaria species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pretoria | 🇿🇦 South Africa |
Rare
Under 5% of wildlife watchers report a Netted Sylph sighting in Pretoria on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 225th most-seen of the 274 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
February–March and December
In those months about 10% of wildlife watchers report a Netted Sylph in Pretoria on a given day, against under 5% in January and April–November, the lowest months. Those are among Pretoria's wettest months, with about 95 mm of rain a month against almost none in July.
Only Pretoria, in our data
Pretoria is the only city on Wallace's Line with enough records to rate Netted Sylph sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Netted Sylph is recorded against all the insects logged in Pretoria (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.
