Cabera exanthemata
In 3 days ~20% in a week ~40%
The common wave (Cabera exanthemata) is a moth of the family Geometridae. The species was first described by Giovanni Antonio Scopoli in his 1763 Entomologia Carniolica. It is found throughout the Palearctic region and the Near East.
The wings of this species are white, heavily spotted with tiny yellowish dots, which give it a buffish appearance. The wings are marked with narrow brown fascia, three on the forewing, two on the hindwing. ab. arenosaria Haw. (= nogentina Th.-Mieg) is darker, more strongly dusted, the lines sometimes scarcely or not at all differentiated. ab. approximaria Haw. has the first two lines closely approximated, almost coalescent.ab.
pellagraria Guen. is said to be larger, apex of forewing more produced, colour whiter, less irrorated, lines perhaps less waved, both wings with a black discal dot. Lyons. — ab. unicolorata Teich, almost unicolorous white, is said to be a prevalent form in Livonia. — The wingspan is 30–35 mm. The egg is oval, green, with fine reticulation. The larva is very variable, green or brown, usually with dark dorsal markings and sometimes with white dots.
One or two broods are produced each year and adults can be seen at any time between May and August.[1] This species flies at night and is attracted to light. The larva, in the British Isles green with yellow rings and black and purple spots, feeds on alder, aspen, beech, birch and willow. The species overwinters as a pupa. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal | |
| 2 | Berlin | 🇩🇪 Germany | |
| 3 | Liverpool | 🇬🇧 United Kingdom | |
| 4 | Nizhny Novgorod | 🇷🇺 Russia | |
| 5 | Hamburg | 🇩🇪 Germany | |
| 6 | Manchester | 🇬🇧 United Kingdom | |
| 7 | London | 🇬🇧 United Kingdom | |
| 8 | Helsinki | 🇫🇮 Finland | |
| 9 | Paris | 🇫🇷 France | |
| 10 | Moscow | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Northern Wave Moth sighting in Porto on a given day, based on 46 verified sightings from GBIF citizen-science data. It is the 144th most-seen of the 498 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.
September
In that month about 20% of wildlife watchers report a Northern Wave Moth in Porto on a given day, against under 5% in October to April, the lowest months. That is one of Porto's driest months, with about 50 mm of rain against 140 mm in January.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Northern Wave Moth sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 11 cities where we can rate Northern Wave Moth sightings, Porto has the highest daily chance: about 10%. Next come Berlin (Germany, under 5%) and Liverpool (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Northern Wave Moth is recorded against all the insects logged in Porto (46 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.
