Calliphora stygia
In 3 days ~10% in a week ~20%
Calliphora stygia, commonly known as the brown blowfly, or rango tumaro in Māori, is a species of blow-fly that is found in Australia and New Zealand. The brown blowfly has a grey thorax and yellow-brown abdomen. This fly is typically one of the first and primary colonizers on corpses, and are considered to be necrophagous and parasitic. It is able to colonize a body within hours after death, when it is considered to be in the "fresh" stage of decomposition. Regardless of the environment a body is in, adult C. stygia will lay eggs in any, and all orifices such as, but not limited to eyes, nose, mouth, and wounds that occur before and after death.
Colonies are formed from larval masses that congregate in the abdomen and chest cavity of a corpse. C. stygia, being native to Australia and New Zealand, co-exist with other necrophagous flies such as C. hilli, L. sericata, and C. vicine. C. stygia is part of a natural process of decomposition called succession: flies that tend to colonize after C. stygia, are C. rufifaccies and H. rostra.
Calliphora stygia has a brassy abdomen with a dense, tessellate golden dusting. The underside of the body and the femora and tibiae of... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Brown Blowfly sighting in Auckland on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 527th most-seen of the 689 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
February and November
In those months about 10% of wildlife watchers report a Brown Blowfly in Auckland on a given day, against under 5% in March–October and December–January, the lowest months.
Yes
Of the 2 cities where we can rate Brown Blowfly sightings, Auckland has the highest daily chance: under 5%. Next come Melbourne (Australia, under 5%).
GBIF citizen-science records
It is estimated from how often the Brown Blowfly is recorded against all the insects logged in Auckland (7 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.
