And seven of the "clean" animals.
... and keep in mind... the whole class of dinosaurs known as Ornithischia (the "bird hipped" dinosaurs) would have been "clean" - so that means seven of all the different species of Ornithischia - which includes all of the different species of stegosaurus, the Ankylosauria, the various Raptor species, etc.
But how can you possibly expect to get all those creatures on a wooden vessel that is less than 300 feet in length?
I know, I know... "Noah's Ark" was actually a great deal more than 300 feet in length... but:
No wooden vessels have ever been constructed longer than 300 feet and been sea worthy. See:
http://www.talkorigins.org/faqs/woodmorappe-review.html
There's even
a church in Maryland that tried to build a building to the dimensions of "Noah's Ark" - but they couldn't get the permits because no structure of any kind is allowed to be built solely of wood in excess of 300 feet - according to the uniform building code. So, they had to add steel cross members for rigidity and concrete piers (see attached picture).
Why hasn't anyone actually built an actual replica of Noah's Ark just to prove all of the naysayers wrong? Surely someone like Pat Robertson or Benny "Billionaire" Hinn has the resources to set us all straight.
There is a guy in Holland who has built a scaled down version of the Ark. His is just 229 feet long - and even then, he had to use a steel hull just to get a license to host pier-side passengers.
http://en.wikipedia.org/wiki/Johan's_Ark
http://www.arkvannoach.com/ Click the English flag for a (sort of) English translation of the website.