Asked in Science, Cats (Felines), Dog Health, Definitions
Why don't 17 year old cicadas and 13 year old cicadas appear together?
They do appear together. Cicadas appear every year in late summer.
Asked in Math and Arithmetic
If Cicadas have predators with 2 year hibernation cycles how often would 12 year cicadas face their predators?
how often would a 12 year cicada face its predator with a 2 year cycle?
Asked in Prime Numbers
Why do cicadas come out during prime number years?
Suppose the cicadas come out every C years and a predator comes out every P years. Then the life cycles of the predator and the cicadas will coincide every LCM(C, P) years. The predator will want it to happen as often as possible while the cicadas want that to happen as seldom as possible. If C is co-prime with P then the cycles coincide after CP years - which is best for the cicada. Suppose the cicadas come out every C years...
Asked in Japanese Language and Culture, Japan
What do cicadas symbolize in Japan?
Cicadas may be annoying to the people in the United States, but they are actually valued in the Japanese culture. They are basically the symbol of summer in Japan. You often see little children with nets trying to catch these insects during summers in Japan, and the "songs" of cicadas are even used in movies and TV programs to symbolize summer and heat. ...
Asked in Insects
How are cicadas different then dragonflies in the way they feed?
Cicadas stick their proboscis into a tree branch and suck the juices from the tree. You should check out Massachusetts Cicadas for a lot more on that. ...
Asked in Animal Life, Prime Numbers
How did the cicadas decide that they would wait a prime number of year before emerging?
To think of cicadas as "deciding" something is anthropomorphizing; that is, using words that describe human attributions with things that don't really think as humans do. What probably happened is that those cicadas which happened to have a prime number cycle tended to avoid having predators match their periodic appearances and so increased relative to those that didn't, and as a consequence, got eaten. This is Natural Selection. Incidently, only Periodic cicadas have prime number cycles (17 or 13 years); there are also Annual...