Whalers have plucked giant whales from the sea for much of the last century, reducing their numbers by up to 99 percent for certain species. Some scientists thought that krill — the tiny crustaceans that many whales eat in gargantuan gulps — would explode in number as a result, mostly free from the feeding pressure of the largest animals that have ever lived.
But that didn’t happen. Instead, Antarctic krill numbers have dwindled since the mid-20th century, by more than 80 percent in areas heavily trafficked by whalers. Many other consumers of krill, like seabirds and fish, have suffered too in the absence of the crustaceans and their giant
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