Raccoons!
It was only dusk, not yet full dark, so when I heard more odd noises outside the kitchen window, I peeked out. Raccoons! At least five of them! Presumably, this is the same family I overheard about a week ago. They weren't as talkative this time, but what vocalizations they did make sounded the same. They didn't *smell* the same, but it may be that one of them had recently had an argument with a skunk upon the previous occasion.