A Gray Whale
It depends what you mean by biggest. Heaviest? Blue whale. Longest? Probably the Ribbon worm which can get twice as long.
Blue whale or Sperm whale.
The blue whale. The heaviest blue whale measured at about 418,878 pounds.
walrus and whale.
turtle! my turtle is very scared of my hermit crab
Blue Whale
The heaviest animal is the blue whale which weighs 190,000kg (418,878lb)
The blue whale is the heaviest creature in the sea (considerably heavier than even the largest dinosaur).
The blue whale.
The Blue Whale
sperm whale.
The Blue Whale