I need a naturalist's help. Last night after 10 PM, I heard a repeated sound that I believe was a night calling bird. I checked my bird book, but the sound did not meet the descriptions of any owls or nightjars. The call was almost the opposite of a screech owl. Although it was in the same range, it rose in pitch and had no trill. It repeated over and over for at least a half hour. I heard Barred owls in the background, but this sound was not nearly so deep.