Gliding gracefully through the marine waters, the blue whale is considered to be the largest creature to have ever existed.

The sperm whale has the largest head of any animal, with heads reaching up to 20 feet long. These sharks have a huge head, which they use to filter feed. Whale sharks also have large heads that are ...

Blue whales are the largest creatures on the planet, stretching 80 to 100 feet long and weighing in upwards of 290,000 to 330,000 pounds. However, despite their size, marine biologists say they now ...