Monterey Bay Whale Watch said more than 1,500 dolphins were spotted by the company's scouting boat when it went out to perform a survey.

They were on the horizon I feel like as far as I could see,” said the boat caption who was in the middle of it.

A miles-long cluster of dolphins has been filmed leaping and gliding across Carmel Bay off the central coast of California, forming an unusual “super pod” of more than 1,500 of the marine creatures.