I think it could fit in HS, since it comes from a movie, but I'll bet it will work well in AK as well. AK currently is devoted to real animals, but animals can be mixed with imagination to produce new creations. This is already done in many Disney movies - real lions don't talk, but they do in The Lion King.
AK and HS have similar attendance, both around 9.6 million visitors in 2010 (compared with 17 million for Magic Kingdom, see link below). I wonder, though, how many hours people stay in the park - the perception is AK is a 1/2-day park, and that's how I usually handle it. It could be an all-day affair if you really want to take your time and look at animals, but that's not really my thing. :shrug:
http://www.coastergrotto.com/theme-park-attendance.jsp