Passengers on a whale watching trip in California were treated to the sight of a rare white dolphin Sunday.

Passengers and crew aboard a Monterey Bay Whale Watch vessel spotted the white Risso's dolphin as it swam alongside gray pod mates.

Naturalist Melissa Galleti provided images to the media, showing the dolphin with its mother and two cow-calf pairs.

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Passengers and crew aboard a Monterey Bay Whale Watch vessel spotted the white Risso's dolphin as it swam alongside gray pod mates

Naturalist Melissa Galleti provided images to the media, showing the dolphin with its mother and two cow-calf pair.

Grind TV reports that the crew was unable to tell if the dolphin was a true albino, which would require pink eyes, or simply a partial albino, which would exhibit blue eyes.

,,'this little one kept coming to the surface with its eyes closed,' Galieti wrote on the company's Facebook.

She added in an email: 'It also exhibited some play behaviors, like pec-fin slapping and rolling. All the guests were excited to see something so stunning.'

The crew was unable to tell if the dolphin was a true albino, which would require pink eyes, or simply a partial albino, which would exhibit blue eyes

Rissos are identifiable with their stout, blunt-noses

It's body appears to carry a pink tinge in some images.

Rissos are identifiable with their stout, blunt-noses.

Though it is uncertain whether the dolphin was a full albino, it's body appears to carry a pink tinge in some images

They also typically appear dark gray with scars generally caused by other Risso dolphins, squids, and parasites.