
Continuity mistake: Near the end of the movie, when Oppenheimer is being interrogated in the small room, his lawyer is on the phone (we later find out it's Kitty). In a wide shot, he gives Oppenheimer the phone, and he puts it to his left ear. The next shot is a tight shot of Oppenheimer's face with the phone to his right ear.
Answer: While sounds and words can be used to alert orcas and dolphins, they recognize the hand signals and movements as to what to do.
LorgSkyegon