Whale and dolphin brains produce more heat than those of humans. What exactly does that mean?

Whale and dolphin brains produce more heat than those of humans. What exactly does that mean?

We have all heard the mantra that dolphins and whales (cetaceans) are highly intelligent animals. Some claim they’re on par with great apes and humans—maybe even smarter. But where does this concept come from? There are two lines of thought.