This video says about itself:
From National Geographic in the USA:
Using supersensitive microphones, Ken Balcomb has been eavesdropping on the region’s resident killer whales, also known as orcas.
Unlike their transient brethren, these animals spend their entire lives in the sound.
But Balcomb’s years of research unveiled a disturbing trend: Mature orcas were disappearing in the prime of their lives, and no one knew why.
Then, when his equipment was blasted by a cacophony from a passing Navy vessel, Balcomb suspected he’d found at least one piece of the puzzle.
See also here.
- Watch: Giant pod of orca whales spotted in B.C. (o.canada.com)
- NOAA: Puget Sound killer whales to stay protected (sacbee.com)
- Rare parade of orcas give Galiano Island residents an incredible show (grindtv.com)
- Killer whale ‘first for east coast’ (bbc.co.uk)
- ‘Eat your hearts out, whale watchers’: Citizens capture stunning footage of huge orca pod off Galiano Island (theprovince.com)
- Young orca, crying for its mother, freed from bay (grindtv.com)