We were woken a little after midnight by a hoarse barking sound under our window. It went on at intervals of maybe 2 or 3 seconds between each bark. There was an answering bark in the middle distance as well.
The barking moved from yard to yard pretty quickly, but seemed to come back to our yard several times before moving off for good.
This morning I found this sound which I'm pretty sure is what we heard last night: http://www.youtube.com/watch?v=zk1mAd77Hr4