It's also a great opportunity to take a walk at dusk out on to the heathland and listen out and maybe even see a nightjar. This usually involves standing around, quietly for several mintues waiting for the churring to start.
Sometimes you're lucky and they come quite close, occasionally you get a fleeting glimpse as one flies close by or overhead and even better is whenyou see one silhouetted on a branch.
We did hear one or two but they were way off in the distance and didn't get any closer before it got too dark and we left.
There was a tawny owl close by though and a variety of different bats to keep us interested.
Nightjars are elusive, rarely seen and migratory. To stand the best chance of hearing one - check your local RSPB reserve and see if they are running any events.
Common Nighthawk, Chordeiles minor (Photo credit: Wikipedia)