I remember watching a documentary once and learned that whales need to eat tonnes (literally) of krill per day to survive. I don’t understand why this is better than eating small amounts of large fishes instead.
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The immediate reason is that their throats are small enough to choke on a football (NFL or FIFA interpretation).
The bigger reason behind that is they are massive creatures. It would require an enormous expenditure of energy to move fast enough for long enough to catch sizeable prey, which would be an unsustainable survival model. On the contrary, those that kept eating small creatures could stay chill and just open their mouths, which is a more sustainable model.
The latter format won their “survival of the fittest” and now we have the big boys that eat small foods.
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