Acklay

Acklays were amphibious reptillian crustaceans with six deadly claws and razor-sharp teeth native to the planet Vendaxa. They were used as execution beasts by the Geonosians, and one attempted to kill Obi-Wan Kenobi, Anakin Skywalker, and Padmé Amidala in the Petranaki arena prior to the outbreak of the Clone Wars.