Cicada invasion begins as Brood XIV swarms parts of U.S. See photos.

This year's cicada invasion has started as Brood XIV emerges from underground and swarms parts of the U.S. 

The insects are expected to be concentrated in Kentucky and Tennessee, and show up in parts of Georgia, Illinois, Indiana, North Carolina, Virginia, West Virginia, as well as in Cape Cod, Massachusetts, central Pennsylvania and Long Island, New York.

It is a one-in-17-year event for Brood XIV, which digs its way up from the soil as it warms and descends on neighborhoods in the billions. The brood, however, is the only group emerging this spring, meaning there likely won't be as many cicadas as last year when multiple broods surfaced simultaneously.