Mono Lake in California is said to have formed 760,000 years ago. One of the oldest lakes in North America, they estimate that it was originally 900 feet deep and surrounded by volcanoes during the last ice age. The lake's extreme salinity and alkali content makes it impossible for any fish to live here. But the lake is host to Artemia Monica, a small brine shrimp that is only found here and nowhere else on earth.
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