Read it through (quickly though). One thing that I did not get is why the alien should be around 310kg. If I were to naively use the same arguments: as surely a

Read it through (quickly though). One thing that I did not get is why the alien should be around 310kg. If I were to naively use the same arguments: as surely as I am probably from a country with a very high population, and as surely as I probably have a common bloodtype, surely I have probably a very common weight? So should not the average alien bij somewhere around 80-100kg?