Many might think that whales are fish!  They are actually mammals.  Whales can be found in the ocean waters all over the earth.  Whales are also the largest creatures that have inhabited the planet.   The largest whale is the "Blue Whale" and they can grow to be over 100 feet long and weigh 400,000 pounds.  Whales may eat fish, krill, squid, crustaceans, and plankton.  When a whale calf is born it is able to swim.  The mother whale nurses the baby calf until it eats fish on its own.