Add Yahoo as a preferred source to see more of our stories on Google. The blue whale holds the title as the largest animal ever known to have lived on Earth. This video explores how big blue whales ...

I take a look at the largest animals ever documented in Earth’s history.

Blue whales are the largest creatures on the planet and can weigh more than 150 tons, so only rarely are the great leviathans observed traveling at high speeds. But on Monday off Dana Point, Ca., ...