While joined to Lake Nicaragua the Bull sharks of that lake cannot migrate to Lake Managua due to a 12 foot high waterfall on the Tipitapa River.
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Virgil "Bull" Sharkowski (voiced by Phil LaMarr) is a bull shark who enjoys beating up smaller kids and stealing their lunches.
Roboshark starred in a BBC Natural History Unit Wildlife Special entitled "Smart Sharks: Swimming with Roboshark", in which a camera attached to the robotic shark was used to capture unique underwater footage of whale sharks, bull sharks, and great white sharks.