Weighing more than 330,000 pounds (150,000 kg) and measuring more than 100 feet (30 m), the Blue Whale (Balaenoptera musculus) is the largest animal to have ever lived. The tongue of a blue whale weighs as much as an adult elephant, an entire whale weighing approximately the same as 24 adult elephants. Despite their massive size, blue whales are baleen whales, which means they have baleen filters instead of teeth. To feed, the whales forces water through their baleen plates, filtering out tiny krill to eat and pushing out the water. Krill are very tiny animals, about the size ranging in size from a grain of rice to a jelly bean. Which means that the largest animal ever on earth feeds solely on one of the smallest animals in the ocean.