Baleen Whales Are Just the Size they Ought to Be

 IN THE HUNTER/GATHERER EQUATION, FILTER-FEEDING BALEEN WHALES came down on the gathering side millions of years ago.  Gathering – in baleens’ case taking the form of filtering shrimp-like krill and other crustaceans, small fishes and phytoplankton out of the ocean waters with great baleen plates in place of teeth – has made them much more efficient feeders than their toothed cousins. A study by researchers at Stanford University suggests that the largest whales grew to

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