露脊鯨
Acoustic detection and visual searches are often used in conjunction. Right whales are detected acoustically then are located visually by shipboard observers. In August 2004, NOAA listening devices in the southeastern Bering Sea detected right whale vocalizations. The researchers then deployed directional and ranging sonobuoys to locate the calling whales. This information allowed researchers to find visually the whales and photograph, biopsy dart (to collect genetic samples) and tag two whales.