It is surprisingly hard to determine how much more inteligent we actually are. We know there are animals that use tools (ravens), animals which can call other members by names (elephants, whales), animals that can learn a number of words, even a small number of simple sentences.
How much smarter are we on the spectrum of intelligence? Is it 100% smarter than say dolphin? (Who pokes pufferfish to get high and apparently can do a low level arithmetics). Or just 1%? You are correct we as Humans seem to be the most intelligent species on Earth, but well somebody has to be and maybe we are not that ahead of other animals, it only seems that way because of how we perceive intelligence.
From what I can say, the biggest difference between us and other animals is our ability to write, namely an ability to pass information and knowledge in written form. And well, without tools that is hard to do under water. Maybe it is that simple? Maybe the smartest species just happend to figure out writing on the dry land, because it was easier. 🙂
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