Sandalus niger
In 3 days ~10% in a week ~30%
Sandalus niger, known generally as the cedar beetle or cicada parasite beetle, is a species of cicada parasite beetle in the family Rhipiceridae. It is found in North America. Although both females and males fly, the females are usually found motionless on the side of the elm trees. Males fly throughout the afternoon during temperatures ranging from 15 to 30C, anything below 15C causes the males to be immobilized. Unless it involves periods of mating, in this case, they stay motionless and do not fly. Once mating is completed, the females go high into the trees, around 10 meters or higher, before releasing their eggs in holes or behind the bark of the elms. 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 Cedar Beetle sighting in Chicago on a given day, based on 86 verified sightings from GBIF citizen-science data. It is the 171st most-seen of the 978 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
September and October
In those months about 10% of wildlife watchers report a Cedar Beetle in Chicago on a given day, against under 5% in November to August, the lowest months.
2nd of 6
Of the 6 cities where we can rate Cedar Beetle sightings, Chicago ranks 2nd at under 5%. The best odds are in Detroit (United States, about 10%).
Same order: Coleoptera
The closest relatives of the Cedar Beetle that you can see in Chicago (order Coleoptera, Beetles) are Asian Lady Beetle (about 20%), Red Milkweed Beetle (about 20%) and Japanese Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Cedar Beetle is recorded against all the insects logged in Chicago (86 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.
