Magicicada cassini
In 3 days ~20% in a week ~40%
Magicicada cassini (originally spelled cassinii ), known as the 17-year cicada, Cassin's periodical cicada or the dwarf periodical cicada, is a species of periodical cicada. It is endemic to North America. It has a 17-year life cycle but is otherwise indistinguishable from the 13-year periodical cicada Magicicada tredecassini. The two species are usually discussed together as "cassini periodical cicadas" or "cassini-type periodical cicadas." Unlike other periodical cicadas, cassini-type males may synchronize their courting behavior so that tens of thousands of males sing and fly in unison. The species was first reported to the Academy of Natural Sciences of Philadelphia by Margaretta Morris in 1846. In 1852, the species was formally described by J. C. Fisher and given the specific name cassini in honour of John Cassin, an American ornithologist, whose own report was included by Fisher in his publication.
The adult M. cassini is very similar in appearance to other periodical cicadas. It is between 24 and 27 mm (0.94 and 1.06 in) long, measured from the front of the head to the tip of the wings folded over the abdomen. The head is black, the eyes are large and red,... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Baltimore | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Magicicada cassini sighting in Chicago on a given day, based on 362 verified sightings from GBIF citizen-science data. It is the 77th most-seen of the 978 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.
June
In that month about 20% of wildlife watchers report a Magicicada cassini in Chicago on a given day, against under 5% in July to April, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Magicicada cassini sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Magicicada cassini sightings, Chicago has the highest daily chance: about 10%. Next come Baltimore (United States, about 10%) and Washington (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Magicicada cassini is recorded against all the insects logged in Chicago (362 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.
