Walker cicada

Upon Donation in City Folk
Blathers will comment on your donation as follows: "Apparently, walker cicadas cry out in an attempt to obscure the calls of other, similar cicadas. I should think that to the average fellow, it just sounds like the cicadas are merely singing together. In any case, I don't suggest looking for them. Their voices may fascinate, but their faces nauseate!"

Encyclopedia Information
In City Folk, the description of the walker cicada is: "The chirp of this cicada means the end of summer is near."