Adult cicadas face a rough transition from nymph to adult and are always in danger of being eaten. However, quite a few cicadas do survive to mate and lay eggs. By late summer these survivors start to die of — what else can we call it? — old age.
So, a few days ago Aaron found our first half-dead Annual Cicada of the year. It just lay there on the sidewalk, legs folded up, as if it was asleep:
When I picked it up, it started to buzz, vibrating my finger tips. But stopped after two seconds. Turning it over, we could see some body parts involved in making the buzzing sound (red arrow), plus the long, pointed beak it sometimes uses to suck sap from plants (blue arrow):
Aaron and I decided to leave the dying cicada in peace. It was gone the next day, so it may have been found by a hungry bird or curious human.
As noted in the caption, the part you see under the body is only protective — it doesn’t make the sound. The part that actually vibrates to make the buzz is up under the wings, and the muscles that cause it to vibrate are inside the body. If you’re interested in knowing more, there’s a detailed, illustrated description of cicada anatomy here. There’s a good technical description of how cicadas make sound here.
Here’s an interesting observation about humans and cicadas. Although most years Annual Cicadas start singing in late June or early July, I’ve noticed that my Kids’ Cicada Hunt website doesn’t experience a big jump in visitation until 4 to 6 weeks later — when the cicadas start to die. I guess hearing cicadas doesn’t inspire much interest, but a cicada in the hand is worth a visit to cicada website or two. (My site is usually on the second or third page of results.) For comparison, my website statistics can tell when the first Cicada Killer Wasps emerge within a few days. The sight of a giant wasp inspires lots of folks to head for their computers, where they often find this picture of five-year-old Ethan holding dead Cicada Killers.
For a more complete analysis of when people visit my cicada website, check out this old CicadaBlog post.