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The Blue Whale is the largest animal ever known to have existed, growing up to 100 feet long and weighing as much as 200 tons. It belongs to the baleen whales, which are characterized by having plates of fringed keratin instead of teeth for filter feeding. Blue Whales are found in all oceans except the Arctic, but prefer cooler waters. They have a varied diet, primarily consisting of krill, consuming several tons per day during feeding season. The species is known for its distinctive low-frequency pulses and moans, which can be heard for miles. As part of the Aquatic Mammals and Marine Mammals categories, Blue Whales share common characteristics with other mammals such as nursing their young with milk and maintaining a body temperature higher than that of seawater. Their place within the Whales category speaks to their unique adaptations to aquatic life, including streamlined bodies, paddle-like limbs, and specialized respiratory systems for diving deep underwater. Despite being hunted almost to extinction in the 20th century, conservation efforts have helped Blue Whale populations recover somewhat. However, they remain endangered due to ongoing threats like ship strikes, pollution, and climate change.