The talking snake one and the Gaderine swine event are also pretty stupid. It is, of course, likely that there were catastrophic floods in ancient times, we have them even today. Did they cover the entire planet? No. There is not enough water to cover the entire planet. And following a global flood, there would have been nothing for the animals to eat. The Bible seems to assume that once Noah landed on Ararat, then the animals all found their own ways back to their homes. The penguins went a waddling back to Antarctica, the koalas found bamboo shoots to munch on all the way back to Australia, The snakes slithered back to their former homes, of course, avoiding Ireland, and so on.
How could the dodos find their way back to Mauritius? How did the lemurs manage to return ONLY to Madagascar? The Biblical story of the flood is indeed a silly myth.