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In fact, there are a number of creatures with life spans that make the oldest living human seem like a spring chicken in comparison. Here's our list of the 10 animals with the longest life spans  and there's even an immortal animal. CREDIT: limowreck666/Flickr. Geoducks. First on the list are these large saltwater clams that are native to the Puget Sound and have been known to live for at least 160 years.
We determine species life spans usually from captive animals because we can track their ages. So, that's how I arrived at the answer--from animals in captivity. The longest-lived captive animal is the giant tortoise (177 years) and the shortest, the gastrotich (3 days). By the way, Forest Preserve District of Cook County presents examples of extreme old age in a nature bulletin (No. 486-A, dated March 24, 1973).