S-Des
Comfortably Numb
- Joined
- Dec 8, 2005
- Posts
- 6,944
I was talking to Kiten, who's coming up next weekend. I asked if they had the cicadas down there, and was surprised when she indicated she had no idea what I was talking about. I was amused to inform her that we have this giant insect that comes out of the ground by the billions once every 17 years...and it's coming this week. If you've never heard of them, here's the info. It's possibly the strangest reproduction cycle in the entire animal (insect) kingdom.
The northern Illinois brood, which will emerge in late May 2007, has a reputation for the largest emergence of cicadas known anywhere. This is due to the size of the emergence and the research and subsequent reporting over the years by entomologists Monte Lloyd and Henry Dybas at the Field Museum in Chicago. During the 1956 emergence, they counted an average of 311 nymphal emergence holes per square yard of ground in a forested floodplain near Chicago. This translates to 1½ million cicadas per acre. In upland sites, they recorded 27 emergence holes per square yard, translating to about 133,000 per acre. This number is more typical of emergence numbers but is still a tremendous number of insects. For comparison, a city block contains about 3½ acres. When the cicadas start dying and dropping from the trees later in the spring, there are large numbers on the ground, and the odor from their rotting bodies is noticeable. In 1990, there were reports from people in Chicago having to use snow shovels to clear their sidewalks of the dead cicadas.
Cicadas are sometimes mistakenly called locusts. In actuality, they are not at all related to locusts, which are a kind of grasshopper. The male cicadas “sing” during the day to attract females.
Their "singing" is basically non-stop noise. They're harmless, but make virtually everything outside a nightmare. The last big migration was when I was 7. I still remember the trees being completely covered and not being able to take a step in the backyard without a loud "squish". Welcome to Illinois, Kiten.
http://www.extension.uiuc.edu/photolib/lib17/inset/dogday_cicada_seen_head_on.jpg
The northern Illinois brood, which will emerge in late May 2007, has a reputation for the largest emergence of cicadas known anywhere. This is due to the size of the emergence and the research and subsequent reporting over the years by entomologists Monte Lloyd and Henry Dybas at the Field Museum in Chicago. During the 1956 emergence, they counted an average of 311 nymphal emergence holes per square yard of ground in a forested floodplain near Chicago. This translates to 1½ million cicadas per acre. In upland sites, they recorded 27 emergence holes per square yard, translating to about 133,000 per acre. This number is more typical of emergence numbers but is still a tremendous number of insects. For comparison, a city block contains about 3½ acres. When the cicadas start dying and dropping from the trees later in the spring, there are large numbers on the ground, and the odor from their rotting bodies is noticeable. In 1990, there were reports from people in Chicago having to use snow shovels to clear their sidewalks of the dead cicadas.
Cicadas are sometimes mistakenly called locusts. In actuality, they are not at all related to locusts, which are a kind of grasshopper. The male cicadas “sing” during the day to attract females.
Their "singing" is basically non-stop noise. They're harmless, but make virtually everything outside a nightmare. The last big migration was when I was 7. I still remember the trees being completely covered and not being able to take a step in the backyard without a loud "squish". Welcome to Illinois, Kiten.

http://www.extension.uiuc.edu/photolib/lib17/inset/dogday_cicada_seen_head_on.jpg
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