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
It is important to understand this point. There is no “why”.
It just happened. There are a lot of reasons that being large gives you evolutionary advantage (defined as making it more likely that you have offspring), but there is no reason for any animal existing beyond the effectively random circumstances that caused their ancestors genes to mutate in a way that eventually produced the current animal.
“Why” implies that someone or something made a decision. That did not happen. (Unless you believe the “why” is God. In that case, it is a matter of faith and there is no point discussing as it is not provable one way or another.)
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