Top: Kids and Teens: Sports and Hobbies: Toys: Reverse Engineering: Talking Fish (3)
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Boogie Bass Hack - Boogie Bass talking fish, with a "special" 20-second re-recordable message hacked in. Head, tail, and mouth movements are also re-recordable.

Hacking Bigmouth Billy Bass - The beginning of a project to control Bigmouth Billy Bass from a PC.

HowStuffWorks: Singing Fish - How singing fish like the Big Mouth Billy Bass work. Includes a detailed dissection.