Using the dimensions above for the ark, we can see an internal volume of around 30,000 cubic meters. So we’ve filled all of the ark - and half a second one - just for food for elephants, rhinos, bisons, and water buffalos.
One pair of elephants, 1 pair of rhinos, 1 pair of water buffaloes. http://creation.com/speciation-conference-brings-good-news-for-creationists As for the food and care, there are some limited explanations on their web site but the best discussion of it I have seen is in the book Noah's Ark: A Feasibility Study, which is available on the site.
My main point is you are basing your arguments on assumptions that have already been discussed in detail and are not accepted by those you seek to refute. The only thing you have demonstrated is a lack of understanding of your opponent's position.
Sorry, you need TWO pairs of elephants, FIVE pairs of rhinos, and TWO pairs of water buffaloes. Unless you want to talk about evolution at the species level? Of course, I think evolution of one species to another is verboten at the Creation Museum, right?