Blatta orientalis
In 3 days ~30% in a week ~60%
The oriental cockroach (Blatta orientalis), also known as the waterbug (as they live in damp areas) or black cockroach (as their bodies are mostly dark), is a large species of cockroach, adult males being 18–29 mm (23⁄32–1+5⁄32 in) and adult females being 20–27 mm (25⁄32–1+1⁄16 in). It is dark brown or black in color and has a glossy body. The female has a somewhat different appearance from the male, appearing to be wingless at a casual glance, but is brachypterous, having non-functional wings just below her head. She has a wider body than the male. The male has long wings, which cover three quarters of the abdomen and are brown in color, and has a narrower body. Both of them are flightless. The female oriental cockroach looks somewhat similar to the Florida woods cockroach and may be mistaken for it. Originally endemic to the Crimean Peninsula and the region around the Black Sea and the Caspian Sea, its distribution is now cosmopolitan.
Oriental cockroaches tend to travel somewhat more slowly than other species. Often called "waterbugs" since they prefer dark, moist places, they can generally be found around decaying organic matter, in bushes, under leaf groundcover,... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report an Oriental Cockroach sighting in Madrid on a given day, based on 96 verified sightings from GBIF citizen-science data. It is the 28th most-seen of the 457 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
April and June–July
In those months about 20% of wildlife watchers report an Oriental Cockroach in Madrid on a given day, against under 5% in February and September, the lowest months.
7th of 37
Of the 37 cities where we can rate Oriental Cockroach sightings, Madrid ranks 7th at about 10%. The best odds are in Ankara (Turkey, about 40%), Sofia (Bulgaria, about 20%) and Yerevan (Armenia, about 20%).
GBIF citizen-science records
It is estimated from how often the Oriental Cockroach is recorded against all the insects logged in Madrid (96 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.
