For the first eight months, the mother provides its only food. Her milk is so rich that the baby Blue Whale can gain up to nine pounds in one hour. After that, the blue whale will grow longer than a greyhound bus. Blue whales eat mostly a shrimp-like creature called krill and they eat about two tons a day.
The Blue Whale makes a unique four-note call to signal other whales of danger. At more than 150 decibels, this call is the loudest sound made by any living creature and can be heard hundreds of miles away.