Hikers in New Zealand risk polluting the “clearest lake in the world” with a microscopic alga carried on their boots.

A rare "super pod" of more than 1,500 dolphins have been captured on video frolicking and enjoying the waters off the central coast of California. Video footage captured by Capt. Evan Brodsky of ...

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 ...

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.

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 ...

Dolphins crossing Carmel Bay on the central coast of California (Evan Brodsky/Monterey Bay Whale Watch via AP) A miles-long cluster of dolphins has been filmed leaping and gliding across Carmel ...