They average about 85 feet long, but the largest blue whales can be as much as 100 feet long. They weigh between 175,000-285,000 pounds. They eat primarily plankton. In the Arctic they eat three different kinds of shelled plankton. The Arctic and Antarctic waters have up to 20 times more plankton living in them than other warmer waters.
Whales have to come to the surface to breathe.