We're here in the Salish Sea, which is critical habitat for Southern Resident killer whales. They are a critically endangered population. There are only about 75 of them left.They have a very unique and identifiable culture. Both in terms of their vocal repertoire and their behaviors. Marine mammals rely an awful lot on sound underwater for basic life functions, everything from navigating and finding their prey.They've been listed as endangered since 2005, and one of the big barriers to their recovery is ac ...