What popular children's cookie got it's start as a Christmas ornament to be hung on the tree in 1902?

"Animal Crackers are actually a cookie, first produced as Christmas tree ornaments in 1902 by the National Biscuit Company (now Nabisco). They are formed in the shapes of various circus animals and packed in a box decorated like a circus train. Nabisco currently produces about 7 million Animal Cracker cookies per day."