Today"s photo brings us to the banks of Caño Cristales, the "liquid rainbow" that cuts a prismatic path through the heart of Colombia. From June through November, when the clear water is low, the abundant underwater plants that cover the riverbed show off their red, yellow, green, and blue hues. The star of the show—especially in this photo—is Macarenia clavigera, a riverweed that ranges from bright red to deep crimson or purple depending on its intake of sun rays. In August and September, when the florid flora is at its peak, the river"s a coveted nature excursion: Because the ecosystem is so fragile, visits are limited to guided tours.
Go with the rainbow flow
Today in History
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Native American Heritage Month
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Time for brass bands and beer
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It s National Hispanic Heritage Month
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Here s looking at you
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Carl Sagan Day
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Independence Day
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Christmas Bird Count turns 125
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Giving Tuesday
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A visionary artist paints his own garden view
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Get the bear facts
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Love blossoms
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