I was in Prince Edward County yesterday and was lucky enough to hear a chuck-wills-widow! For those of you who don't know what this bird is, it is a close relative of the whip-poor-will. Both are nocturnal species that are notoriously hard to actually see. Fortunately, they are easy to hear! Below are links of video clips I took while I was out:
The call gets loudest at around 25 seconds in.
Here are several whip-poor-will calling for comparison.