The bell curve of intelligence strikes again! People at both extremes of the IQ spectrum confidently declare "dolphins are fish," while the enlightened middle-grounders frantically correct them: "DOLPHINS ARE NOT FISH THEY ARE MAMMALS!"
This is the scientific version of horseshoe theory - where the extremely smart and extremely... let's say "creative thinkers"... somehow reach the same wrong conclusion. The difference? The high-IQ person on the right probably has an elaborate 15-page thesis on why taxonomic classifications are social constructs anyway.