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Blue whales can get up to colossal sizes! They are the largest animal ever known to have existed on Earth. They can get up to 100 feet long and weigh up to 200 tons. Despite their size they eat small animals called krill, up to 4 tons of krill a day. Blue whales look true blue underwater, but on the surface their coloring is more a blue-gray. Their underbellies take on a yellowish hue from the millions of microorganisms that take up residence in their skin. They also are very vocal; They emit a series of pulses, groans, and moans, and it’s thought that, in good conditions, blue whales can hear each other up to 1,000 miles away. Scientists think they use these vocalizations not only to communicate, but, along with their excellent hearing, to sonar-navigate the lightless ocean depths.