Noah's zoo?

If Noah really did took seven pairs of all "ritually clean" animals, and a pair of all "unclean" animals. Then that must mean that Noah is the world's greatest zoologist. Every animal alive today surely must have gone through Noah's observation. He must have travelled through the Arctic to fetch a pair of penguins, to Australia for a pair of kangaroos and crocodiles. And to the Amazon for a pair of anacondas. Doesn't it?