Aerial survey track lines (green dotted lines) for the 2004 North Pacific Acoustic Laboratory marine mammal monitoring effort off Kauai and Niihau, Hawaii. The blue dots represent humpback whale sightings from the aerial surveys. During the eight days of survey effort, 6,112 km of aerial survey lines were flown and 187 humpback whale sightings were recorded (2). Image courtesy of Joe Mobley, Marine Mammal Research Consultants, Ltd.