Well, you can get diagrams of John Montroll's hippo through
Google Book
This is leagal, so moderators, its ok...
Click on the link, and search for "african animals in origami" (or however you spell those things). Click on the first link.
from here, you will have to experiment, you do need a google login (two actually) in order to get the diagrams.
You will have to search for keywords that are likely to be in the page number you want.
I used a few different keywords to get different pages accordingley.
I think I used, Hippopotamus, fold, reverse, and a few others which I do not remeber at the moment.
Hope that helps....
By the way,to my knowledge, this does not break copyright laws.