When Sea lions are blowing bubbles, it could mean to “keep your distance” from ones territory.
Sperm Whale hunts Squids, Demersal rays and they can dive sometimes like 1-2Kilometers down. It can be found in sea of cortex. Sperm whale have this social behavior called Marguerite formation to save/help the injured pod member.
These demersal fishes like stingrays can send electrical signals. The great hammerhead detects the electrical signatures of stingrays buried in the sand and pins them with its “hammer”.