The longest living mammal is the **bowhead whale** (Balaena mysticetus). Bowhead whales can live for over 200 years, with the oldest confirmed specimen being 211 years old. Scientists believe that bowhead whales may be able to live for even longer, as their slow growth rate and low reproductive rate suggest that they have evolved to survive for centuries.

Bowhead whales are large baleen whales that live in the Arctic and sub-Arctic waters of the North Atlantic and North Pacific Oceans. They are known for their thick blubber and baleen plates, which they use to filter food from the water. Bowhead whales are also known for their slow swimming speed and their ability to dive to great depths.

Scientists are still trying to understand why bowhead whales live so long. Some possible factors include their slow metabolism, their cold-water environment, and their diet of plankton. Bowhead whales are also relatively free from predators and diseases, which may contribute to their long lifespan.

Other long-lived mammals include the Greenland shark (Somniosus microcephalus), which can live for over 200 years, and the Asian elephant (Elephas maximus), which can live for up to 80 years. However, the bowhead whale is the undisputed champion of longevity among mammals.
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