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The blue whale is the largest animal ever known to have existed, reaching lengths of up to 100 feet and weights of as much as 200 tons. Its heart alone can weigh as much as an automobile, and its tongue may weigh as much as an elephant. With a mouth that can hold up to one ton of food and water, the blue whale feeds mainly on krill, consuming several tons per day. Its long, slender body is gray or bluish-gray, with mottled patterns on its skin. Despite its enormous size, the blue whale is difficult to spot due to its deep-diving behavior and preference for colder waters. As the top predator in its ecosystem, the blue whale plays a crucial role in maintaining the health of the marine environment.