While these slightly weird looking structures are undeniably big, it's utterly absurd to think they represent a size capable of somehow simultaneously containing two and seven of every species on Earth or even every "kind" of species on Earth. And what's even more absurd is that any human being intelligent enough to tie their own shoes could actually believe this silly fairytale story was an historic event that really happened. Even if we accept that every animal described could safetly fit on a giant boat and not cause it to sink, the notion that this boat had room to also fit the necessarily food supply to sustain them all, had the room for all their excrement, and that none of the animals were eaten by their natural predators is patently absurd.