Cicadas Arrived a Couple of Weeks Ago!

What is the purpose of a Cicada?  The nymphs crawl from holes in the ground, obviously where they have over-wintered.  Shedding its skin, the Cicada leaves its outgrown shell hanging...

The adult emerges...

 

They begin singing in the early morning hours... and chorus all day.

(Calling a mate?)

I've not done a bit of reading about them...

What do YOU know??

SG