Zooplankton’s Nightly Ascent
Imagine the largest migration on Earth happening every single night, right under the ocean’s surface. Billions of tiny creatures rise from the deep like an underwater snowstorm in reverse. These zooplankton spend daylight hours hiding in dark waters 3,000 feet deep. As the sun sets, they swim upward through the water column to feed near the surface. The movement is so massive that old sonar operators often mistook it for the seafloor rising and falling.