What is the animal that moves the most in the ocean

Question: What is the animal that moves the most in the ocean
- Keywords:
  animal,
  marine,
  ocean
Asked by ricardoesteves to Ed, Hayley, Jason, Sophie on 20 Mar 2013.
- Hayley Evers-King answered on 20 Mar 2013:
  
  I’m not totally sure, but I know humpback whales migrate 5000 miles! Our great white sharks also travel long distances.
- Sophie Holles answered on 21 Mar 2013:
  
  Humpback whales do have the longest known migration of any mammal in the ocean, but turtles are even more impressive migrators.. leatherback turtles have been tracked for 12,774 miles! This was the longest recorded journey of any vertebrate in the ocean in 2008. They are the biggest turtles and unfortunately they are very endangered.

Question: What is the animal that moves the most in the ocean