MARTINSVILLE - New Jersey's invasion of cicadas is in full swing in some parts of the state.

News 12 New Jersey’s Tony Caputo headed to Chimney Rock Park in Martinsville where he found thousands of the critters.

Hundreds of News 12 New Jersey fans on Facebook reported seeing cicadas in several counties.

The cicadas are harmless insects that emerge from their underground homes every 17 years.

The insects are best known for the loud sounds the males make in an effort to attract females.

For more on the cicada invasion, watch the clip to the left or click News 12 Extra on Optimum TV channel 612.