I have also thought about how fast species change. I remember hearing about the filming of the movie "Robin Hood" with Kevin Costner in it. They were attempting to be as authentic as possible so they had to find cattle as they were at the time when Robin Hood lived. these cattle were incredibly small compared to what we know as cattle today - in only 700 years the species had changed and diversified to an incredible scale!
anyways, just bits of info on the real Flood and ark that I have assembled over the years.
Don't mistake "species" with "breed". Breeds of dogs, and breeds of cattle, are not separate species, they can interbreed.
But even with a much simplified list of what would really have been necessary, The sheer task of adequate animal husbandry is too daunting to be workable on an ark, IMHO, I haven't seen a reasonable analysis yet of how that could be done, let alone the existence and survival of species not even known to exist yet in the middle east during Noah's time.