So I've been going out to the Bird Studies Canada High Park Nighthawk count (18h00 - 20h30, nightly, until 6 September 2014 on Hawk Hill in High Park in Toronto). Nighthawk numbers have been variable, but one gets reliable as distinguishing the distant nighthawk from the distant chimney swift and the sneaking ring-billed gull.
I have neither the skill nor the equipment to get good pictures of flying nighthawks; if there's light, they're high, and if they're low it's nearly dark, and they're always moving fast.
|Nighthawk kettle. All those dots|
|Centre of the nighthawk kettle|
|Single nighthawk in silhouette|