21 BULLBATS passed low over my house in Darnestown, Montgomery County MD, between 7 pm and 7:45 pm on Wednesday August 23. This species is also known as Common Nighthawk. I much prefer the colloquial name which I learned from my Uncle Robert, a Southern farmer, when I was a teenage birder. The birds were so named because of their crepuscular habit of hawking for insects stirred up by the cows and bulls as the stock came in from pasture in the evening. Also for the resemblance of their wing-whurr display sound to the "Bull-roarer" noisemaker toy invented by Native Americans. Plus, when one of these amazing flyers suddenly appears overhead, it's a heck of a lot more fun and faster to yell "BULLBAT!" than "Common Nighthawk!".  
 
The first group of 13 BULLBATS were flying southeasterly without foraging.  The second group of six was flying north, appearing to forage on the wing.  The others were singles heading north.