Recorded at a small park in north Seattle. A small creek that runs through the park drains into Lake Washington. A tape recorder was left overnight near a pond in the park. The otters were not observed, but were identified based on comparisons of the recorded vocalizations with known river otter sounds. Recorded between 10:00 PM and 12:00 AM. Weather conditions: skies clear, winds calm. No temperature readings available for this recording.