This is half theory, half explanation on how evolution benefited the cephalopods of Splatoon.
First things first and more obvious, both became more intelligent thanks to this, Octolings are obviously more intelligent than Inklings due to the fact that Octolings have evolved from octopi. It's proven time and time again in the Animal Kingdom that octopi are much more intelligent than squids.
Secondly, with heightened intelligence, they were able to create civilizations, something that the only real-world animal who managed to do that is the human. (And yes, humans are animals, much like dogs and cats.)
Third, something that's implied with one character but might as well be canon, Inklings and Octolings do not die when mating and female Octolings aren't cannibals who would try to eat the males who are trying to mate with them. (Yes, female octopi in the real-world are in fact cannibals, which is why male octopi are usually careful when mating with a female). There is evidence for at least Inklings because Cap'n Cuttlefish had at least two children and still survived. The Squid Sisters are not actually sisters but they are actually cousins. With evolution, Octolings acquired the ability to reproduce asexually, which is how the other Octarians came to be, but this way is unreliable to produce enough offspring capable of reproduction in the future for the entire species to survive, which is why Octolings still reproduce sexually to ensure they don't become extinct.
First things first and more obvious, both became more intelligent thanks to this, Octolings are obviously more intelligent than Inklings due to the fact that Octolings have evolved from octopi. It's proven time and time again in the Animal Kingdom that octopi are much more intelligent than squids.
Secondly, with heightened intelligence, they were able to create civilizations, something that the only real-world animal who managed to do that is the human. (And yes, humans are animals, much like dogs and cats.)
Third, something that's implied with one character but might as well be canon, Inklings and Octolings do not die when mating and female Octolings aren't cannibals who would try to eat the males who are trying to mate with them. (Yes, female octopi in the real-world are in fact cannibals, which is why male octopi are usually careful when mating with a female). There is evidence for at least Inklings because Cap'n Cuttlefish had at least two children and still survived. The Squid Sisters are not actually sisters but they are actually cousins. With evolution, Octolings acquired the ability to reproduce asexually, which is how the other Octarians came to be, but this way is unreliable to produce enough offspring capable of reproduction in the future for the entire species to survive, which is why Octolings still reproduce sexually to ensure they don't become extinct.
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