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This, I would think, should be self-evident: Generally speaking, big creatures eat smaller creatures that, in turn, eat even smaller creatures, like this ... And just as obviously, one would expect ...

Whales eat a lot of food. In recent years, experts have estimated that the world’s biggest whales eat between 10 and 20 tons of food a day: the caloric equivalent of 70 to 80 thousand “Big Macs.” ...