Ok, now lets try to fit every female and male of every species into that boat!
Edit: I agree this was a very unclear post. What I meant: The available space is about 20,000 m2. Lets say the African bush elephant fits in 25 m2. This means you can take 400 different kinds of the largest terrestrial animals on board. But I don't think there are that much different kind of large animals.
"Take with you seven of every kind of clean animal, a male and its mate, and two of every kind of unclean animal, a male and its mate, and also seven of every kind of bird, male and female, to keep their various kinds alive throughout the earth."
—Genesis 7:2-3