Well let's see. The road area is flat. The area at the end of the road looks flat. The woods at the end of the road and to the right, wrapping around the last house, look lower than the road. So either the houses are on ground built up by man, or the road is on ground graded lower by man, and in either case the resulting slope between the 2 is man-made.
Female monkeys often utter loud, distinctive calls before, during or after sex..