Otherwise, the skeleton could never support such a weight on land. Another factor making whales so large is their diet. Basically, the lower a predator feeds from the food chain, the more energy it will gain from the food. Large whales, being top on the food chain, feed very very low, on things that even fish and other lower animals feed on. What this means is that all the energy krill has packed in its little body get transferred right over to the whale.
Whales then eat a ton of it per day.
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