The bird or birds would "sing" continuously for about a minute or less, then nothing would be heard for several minutes. Thence, singing would begin again from a different location. This movement made it difficult for me to be close to the bird to obtain a higher quality recording. The sound is clearly audible when played back on my iPhone, but is very faint on my laptop's speakers.
One, and possibly two heard "singing" several times earlier, during our walk, and later -- toot .. toot .. toot, etc. (recording made and included). These owls were heard singing all four nights of our stay in the campground (January 15-18, 2018). The earliest these owls were heard was about 6:15 P.M.
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