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Like all species of baleen whales, the sei whale feeds on tiny creatures known as krill by filtering water through bristlelike keratin structures called baleen plates. In this way, baleen whales can eat up to 30 percent of their total mass per day. And while no one would call the sei whale small—it can have a mass as high as 25,000 kg—it is one of the smaller baleen whales and is much smaller than the bowhead whale, which can weigh a whopping 66,000 kg and consume as much as 19,800 kg of krill per day.