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Frances Marshall, in The Magic Dealer, Vol. 2 No. 5, credits the Sponge Rabbits to Jack Strothers. However, in Magic Manuscript, Vol. 8 No.2, Sept./Oct. 1986, p. 39, Charles Reynolds claims that Carlo (Sommer) invented the idea behind the Multiplying Sponge Rabbits, by marketing a trick in 1930 called “The Gopher Birds”. (See also Magicol, No. 152, Aug. 2004, p. 3.) Bob Nelson is commonly credited with the later sponge-rabbit variation, which he marketed as “Peter Rabbit Goes to Town”.
See also Sponge Balls.