Acoustic recording tags can be attached to whales with a simple suction cup and remain on the animal for as long as several days before falling off. Internal memory built into the tag stores a continuous record of dive activity (pressure), pitch, roll, temperature and continuous acoustic recordings of the low frequency sounds produced by and received at the animal.
The tag is recovered after it has fallen off the animal using a VHF radio transmitter attached to the tag. The tag shown in the photo was made by GreeneRidge Sciences.
Photo Credits: John Calambokidis and Sherwin Cotler, Cascadia Research
Acoustic recording tags are used to determine how often whales produce calls, how their behavior relates to calling activity and to measure the intensity of manmade or other noise sources which may be affecting the behavior of the animal.