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Amazing chart shows the planet's longest-living animals. For humans, reaching the age of 100 is a rare milestone. For some animals, however, it's hardly uncommon. Not all plants and animals age the way we do, and some are built for much longer lifespans than ours. Of the 10 animals that live the longest, all of them live well past 100, according to a recent post in Discovery News. At the top of the list, the ocean quahog (aka the clam) lives to be 400 years old, while the runner-up bowhead whale lives to be 211.
Life expectancy is how long an organism is expected to live. Typically, the life expectancy of an animal increases with size. For example, cows usually live longer than sheep. The life expectancy of sheep is similar to large breeds of dogs, about 10 to 12 years. Some breeds are known for being longer-lived, e.g. Merino. According to the Guiness Book of World Records, the oldest sheep lived to be 23.