RARE, underwater footage of a blue whale (Balaenoptera musculus) feeding on krill (Euphausia pacifica). The whale starts at the surface, it has gulped up a large amount of krill, see throat pleats are expanded. The whale is gaping its mouth, using baleen to filter out krill, letting seawater slip out. The whale continues downward, see the whole whale come toward the camera and swim deeper. Wide underwater shot shows the entire body of the blue whale. A swimmer follows the whale a short time, showing the size difference. Mood shot. The water is thick with krill and nutrients, making it hazy. In Pacific Ocean near San Diego, California, summer. Pretty blue water. The bright ocean surface can be seen from below, at the beginning. Baleen whale feeding on krill. Marine mammal. Plankton. North America West Coast.

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