In part 3 of this mini episode series of "For the Love of Nature", Alison Black joins us from aboard a NOAA ship at sea once again. Allison and her guest, Mary Applegate, a marine mammal observer, discuss the two teams of observers on the survey, their typical day on the ship, and how they record sightings in the ocean. Mary also talks about the acoustics part of their work, where they deploy a recorder to listen to ocean noise and marine mammals.