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Baa.
This is a nice ram model designed by Jun Maekawa. My interpretation of it is unfortunately somewhat goat-like, but I hope you get the general idea.
This goat -- sheep, I mean sheep -- was made from a 10" square of standard origami paper. The final model is approximately 3" long. (I can't find my ruler.) The folding pattern may be found in Maekawa's book Genuine Origami.