The first part of a huge article about Animal Kingdom original artwork is posted today with 40 renderings, ncluding some showing never realised concepts. The part two will be post next week, also with 40 renderings.
Animal Kingdom renderings are pretty hard to find, so i think thes should interest you.
Everything can be seen at:
Disney and more: Disney's Animal Kingdom Original Artwork - Part One
and Part two : http://disneyandmore.blogspot.com/2009/02/disneys-animal-kingdom-original-artwork_25.html