I understand, generally, *how* they got that big but not *why*. What was the evolutionary advantage to their massive size? Is there one? Or are they just big for the sake of being big?
In: Biology
Because they consume tons of water at a time to filter out tiny living creatures called krill, the only way using their method of feeding to get enough krill is to take up huge mouthfuls at a time. Krill are tiny transparent crustaceans looking like tiny shrimp and feed in the southern oceans around Antarctica and in turn are eaten by baleen whales and especially the blue whale. https://youtu.be/RH6tuE1qxHo
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