Okay then, why aren giant squids and blue whales bigger?
Typically people ask why giant squids and blue whales are so big, but by far the more interesting question is why aren’t they bigger? No one knows for sure. Perhaps given another few million years of evolution, super-sized whales and squids will roam the oceans terrorizing smaller animals.On the other hand, maybe they are not bigger because they don’t need to be. Their size is adequate to fend off predators or ensure they don’t have any. They can be large enough to eat whatever they want, or exploit some novel way of interacting with the surrounding ocean.Or maybe whales and squids cannot evolve larger sizes because of physical constraints to their maximum size. For example, maybe blue whales cannot find enough krill to eat to sustain anything beyond their present size. Consider also that a blue whale’s heart is already the size of a Volkswagen Beetle. That heart must circulate blood through more than 80 feet of whale and get oxygen to every cell in a 100-ton animal! With every additio
