The octopus’ Cephalopod cousin, the cuttlefish, is no less intriguing. Itself a clever chappie, they have one of the highest proportions of brain size to body size of all invertebrates. But all the more crazy is that the brain itself is shaped like a donut (a bit of a messed up donut) and the esophagus passes straight through the hole. They must really get serious brain freeze when they eat ice cream too fast!
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