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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.
The ocean quahog is large bivalve that can reach a height of up to 10 cm. It grows rather rapidly during the first years, but the growth slows down after it reaches sexual maturity at the age of about 20 years, at the size of 6 to 7 cm. The ocean quahog can live to a very old age; the oldest individual measured in Icelandic waters was estimated to be about 400 years old. This makes the ocean quahog the longest lived animal on earth. The ocean quahog lives buried in the sediment so only a small opening of the shell is visible.