Suddenly, he became aware of a huge shape to his left, moving fast towards another ball of krill near the surface. It was an adult blue whale, probably about 20 metres long. 'Opportunities like this ...

The heart of a blue whale can weigh up to 1,300 pounds, while its tongue can weigh 5,400 pounds, which is the average weight of an adult female elephant. Blue whales have sleek, streamlined bodies ...