Entomologists said the population boom may have its origin in the heavy rains of 2007, but whatever the reason, it has been impressive, the San Antonio News-Express reported Monday.
"They usually don't sing all day long or all night long unless there are a whole lot of them," said David Huffman, a Texas State University biology professor. "By far and away, in terms of geography, in terms of number of reports, this is the most we've seen."
Giant cicadas measure about 2 inches long and create a king-sized racket used for mating purposes.
Scientists told the News-Express knowledge of the cicada is relatively scarce because it is considered to be neither an agricultural or urban pest, so research is limited.
Senate Democrats to pull all-nighter on climate change
Scarlett Johansson steps out with fiance after pregnancy reveal