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Lord Kelvin - Wikipedia disagrees: The "Two clouds" speech:

I agree, in fact I would say that "humanoid aliens" is the biggest flaw in the whole "UFO Aliens" phenomena, they look far too much like us to have come from anyplace other than inside our minds. A squid is an example (octopus or cuttlefish is a better example) of an animal with a body plan vastly different than vertebrates. Since there is no reason to think vertebrates are inevitable in the process of evolution, in fact IMHO vertebrates are a fluke and could have easily been passed over by natural selection or simply failed to evolve at all, vertebrates evolved from invertebrates and not the other way around there is no reason to think that the evolution of vertebrates is inevitable or even likely.