A miles-long cluster of dolphins has been filmed, forming an unusual “super pod” of more than 1,500 of the creatures.

A miles-long cluster of dolphins was filmed leaping, gliding and cavorting their way across Carmel Bay on the central coast of California.

More species are declining than are improving, but some bright spots show that conservation efforts can bring species back.

A mileslong 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.