Snail and Sea Anemones – Photograph by Brian J. Skerry for National Geographic.
A snail crawls across a group of jewel sea anemones off the Irish coast. Anemones can be tiny, a mere half an inch (1.25 centimeters) across, or as large as 6 feet (1.8 meters) in diameter. Life spans are difficult to determine, but some species are known to live more than half a century.
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