These monstrous mammals are the largest animal ever! Even the bigger than any dinosaur! They can grow to be 100 ft long and 155 tons.  That's a lot of whale.  The real color of the blue whale isn't really blue it's actually dark - slat blue, a grayish - blue color.  Now, what do you think  feeds that whole whale?  Krill! The tiniest food that the biggest whale could possibly eat.  What do you think could they eat it with?  Teeth? Tongues ? Nope! They eat it with baleen. Baleen is a bone - like teeth that strain Krill from the water