WATCH: Dolphin Gets 'Belly Rub' From Boat In Oceanside

OCEANSIDE, CA — A playful pod of dolphins were captured on camera by Oceanside Adventures, with one of the marine mammals enjoying a "belly rub" from the dolphin and whale watching tour agency's boat.

The video, which was shot Monday off Oceanside by first mate Chris Fairbanks, shows a Pacific white-sided dolphin swimming upside down near the front of the boat.

The dolphin was among a pod of about 30 Pacific white-sided dolphins spotted "bow riding" the 50-foot catamaran, according to Donna Kalez, co-president of Oceanside Adventures. But this particular dolphin swam upside down for about two minutes.

"The dolphin appeared to be scratching its belly on the boat's pontoon — something the crew has never seen," Kalez said. "The boat's captain, Shane Hansen, was also amazed once he saw the video. These dolphins are truly amazing."

Pacific white-sided dolphins, known for the distinct coloring that give them their name, are also sometimes known as "hookfin porpoise" because of their large, curved dorsal fin, according to NOAA Fisheries. In the U.S., they live off the coasts of California, Oregon, Washington and Alaska.