Joel Sartoreのインスタグラム(joelsartore) - 12月21日 00時09分

The seventh day of Photo Ark brings us seven Iowa Pleistocene snails. These endangered snails measure less than a quarter of an inch in diameter and are often found within the leaf litter of algific talus slopes - rare, delicate ecosystems found in Minnesota, Wisconsin, Illinois and Iowa. Amazingly, these snails must live in the cold, even in Iowa's summertime, so they stay in drafts of cold air pushing out of cracks in rocks of the Pleistocene-age hills of northeastern Iowa. Ice inside the hills left over from the Ice Age generates cold air year-round.

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