The blue whale is the largest creature to have ever lived on earth, but there are still unanswered questions when it comes to the blue whale's deep sea habits.
The blue whale is the largest creature to have ever lived on earth, but there are still unanswered questions when it comes to the blue whale's deep sea habits.
General Note
Originally released by BBC Worldwide Learning, 2011.
Streaming video file encoded with permission for digital streaming by Infobase on April 18, 2015.