Phasis thero
In 3 days ~40% in a week ~70%
Phasis thero, the silver arrowhead or hooked copper, is a butterfly of the family Lycaenidae. It is found in South Africa. The wingspan is 31–46 mm for males and 38–47 mm females. Adults of subspecies P. t. thero are on wing from September to November and again from March to May in two generations. Adults of subspecies P. t. cedarbergae are on wing from October to November and probably also in autumn.
The larvae feed on Rhus undulata and Melianthus major. Larvae have been found inside hollow stems of their food plant, but also in nests of Crematogaster peringueyi ants at the base of these stems. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | De Hoop Nature Reserve | 🇿🇦 South Africa | |
| 2 | West Coast National Park | 🇿🇦 South Africa | |
| 3 | Garden Route National Park | 🇿🇦 South Africa | |
| 4 | Table Mountain National Park | 🇿🇦 South Africa |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cape Town | 🇿🇦 South Africa |
Possible
About 20% of wildlife watchers report a Silver Arrowhead sighting in De Hoop Nature Reserve on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 14th most-seen of the 25 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
November
In that month about 40% of wildlife watchers report a Silver Arrowhead in De Hoop Nature Reserve on a given day, against under 5% in June–September and December–April, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Silver Arrowhead sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 4 parks where we can rate Silver Arrowhead sightings, De Hoop Nature Reserve has the highest daily chance: about 20%. Next come West Coast National Park (South Africa, about 20%) and Garden Route National Park (South Africa, about 10%).
GBIF citizen-science records
It is estimated from how often the Silver Arrowhead is recorded against all the insects logged in De Hoop Nature Reserve (7 verified sightings from 2019 to 2026), 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.
