I saw several of these at Perryman Park in Harford County, MD on August 21st, 2010.

These were at the same park on July 3rd, 2011.

I saw this one near the new impoundment at Swan Harbor Farms on July 24th, 2011.

This one was at Perryman Park on July 22nd, 2012.

I saw these at Swan Harbor on August 17th, 2012.

These were also at Swan Harbor on August 31st, 2012.

I saw this one at Perryman Park on June 23rd, 2013.

This one was in the same place on June 30th, 2013.

These were at Swan Harbor on July 3rd, 2013.

I saw this one at Assateague Island on July 16th, 2013.

These were at Bombay Hook NWR, DE on July 16th, 2013.

I saw these at Perryman Park on June 28th, 2014.