They include some of the largest animals on Earth. The blue whale is the biggest animal that has ever existed. Whales can be ...

The sperm whale is the world's largest predator and dives deeper than any other mammal - up to depths of over 2,000m. Its call reaches 220 decibels, the loudest made by any creature on Earth ...

Read more about sperm whales: http://j.mp/sOSais Watch underwater footage of the mammal and hear its strange clicking sounds that are crucial to their survival What ...

That's right: The biggest whale ... sperm whales, orcas and North Atlantic right whales) emit clicks and interpret the resulting echoes for communication. Let's dive into more facts about the ...