Michael Kantor of Venice recorded dolphins swimming from Marina del Rey to Catalina on a sailing trip he took in early September.
"They're so smart, and they have their own language and there's something about them," Kantor said in a KTLA interview. "They're just fast. They're strong. They always look like they're smiling. I don't know what that is," he added.
Kantor attached a waterproof camera to a broomstick to record the dolphins.