Blue Whales

• Only about 5,000 blue whales remain today.
• The largest animal in the world, the blue whale can weigh up to 160 tons. That's the same weight as 32 elephants, or 1,600 people.
• Blue whales can swim up to 30 miles an hour when frightened.
• A blue whale's heart is the size of a small car.
• Blue whale calves, or babies, can drink up to 100 gallons of milk a day.

Where do they live?
Blue whales swim long distances from the tropics to Antarctica to the Arctic.

Why are they endangered?

• Hunting
• Accidents with ships
• Pollution
• Tangled up by fishing gear

(Photo: © Kennan Ward/Corbis)