A recent Scientific American article by Katherine Harmon Courage talks about the ocean twilight zone and the “Greatest migration on Earth (that) happens under darkness every day.”

Every evening around the world trillions of zooplankton, many smaller than a grain of rice, hover hundreds of feet below the surface of the sea, waiting for their signal. Scientists long considered these tiny animals to be drifters, passive specks suspended in the ocean, moved by the whims of tides and currents. And yet, just before the sun disappears, the swarms begin to rise on a clandestine journey to the surface. (Read More)

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