1,500 dolphins captured on stunning drone video as they frolic off California coast: "They were having a big party"

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.

"They were on the horizon I feel like as far as I could see," said Captain Evan Brodsky, with the Monterey Bay Whale Watch, who captured drone footage of Friday's huge gathering of Risso's dolphins.

The sighting was rare: Risso's dolphins typically travel in groups of only 10 to 30 animals, according to the National Oceanic and Atmospheric Administration.