I came across these amazing little creatures by Roman Diaz when I was browsing flickr. I did some digging and found that he's actually authored two origami books, Origami Essence and Origami for Interpreters. I read an interview about him, and my Spanish is not great, but I think it said he was a veterinarian in Montevideo, Uruguay and had been designing and making his own origami animals since age 10 or 11. No doubt his scientific knowledge of animals helps his origami. I think he is incredibly gifted!
Click here to see more images of Diaz's origami.