Cossus cossus
In 3 days ~20% in a week ~40%
Cossus cossus, the goat moth, is a moth of the family Cossidae. It is found in Northern Africa, Asia and Europe. This is a large heavy moth with a wingspan of 68–96 mm. The wings are greyish brown and marked with fine dark cross lines. The moth flies from April to August depending on the location.
The caterpillars have a red/purple stripe across the back and a black head. They reach a length of 9–10 cm. The caterpillars feed in the trunks and branches of a wide variety of trees (see list below), taking three to five years to mature. The caterpillar holes can be found low on the stem (maximum 1.0–1.5 m above the ground). When ready to pupate the caterpillar leaves the tree to find a suitable spot.
The species prefer humid environments. Both the larva and moth have a smell reminiscent of goat, hence its name. Pliny reported in Natural History that a grub which he gives the name cossus was considered a Roman delicacy after it was fed with flour. Some writers have equated this with Cossus cossus, but Pliny specifies that his cossus is found in oak trees, which makes this identification unlikely.
It has a preference for Populus,... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gauja National Park | 🇱🇻 Latvia | |
| 2 | Białowieża National Park | 🇵🇱 Poland | |
| 3 | Triglav National Park | 🇸🇮 Slovenia | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Tatra National Park | 🇸🇰 Slovakia | |
| 6 | Wadden Sea National Park | 🇩🇪 Germany | |
| 7 | Cévennes National Park | 🇫🇷 France | |
| 8 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 9 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 10 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Prague | 🇨🇿 Czechia | |
| 3 | Stockholm | 🇸🇪 Sweden | |
| 4 | Vienna | 🇦🇹 Austria | |
| 5 | Essen | 🇩🇪 Germany | |
| 6 | Minsk | 🇧🇾 Belarus | |
| 7 | Saint Petersburg | 🇷🇺 Russia | |
| 8 | Nizhny Novgorod | 🇷🇺 Russia | |
| 9 | Berlin | 🇩🇪 Germany | |
| 10 | Warsaw | 🇵🇱 Poland |
With luck
About 10% of wildlife watchers report a Goat Moth sighting in Vienna on a given day, based on 106 verified sightings from GBIF citizen-science data. It is the 145th most-seen of the 1406 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.
April–October and December
In those months about 10% of wildlife watchers report a Goat Moth in Vienna on a given day, against under 5% in January–March and November, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Goat Moth sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
4th of 21
Of the 21 cities where we can rate Goat Moth sightings, Vienna ranks 4th at about 10%. The best odds are in Helsinki (Finland, about 20%), Prague (Czechia, about 10%) and Stockholm (Sweden, about 10%).
GBIF citizen-science records
It is estimated from how often the Goat Moth is recorded against all the insects logged in Vienna (106 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.
