A Cuiu-Cuiu, a prehistoric-looking catfish found in the Orinoco and surrounding rivers of the Amazon. The Cuiu-Cuiu can grow to 3 feet in length and weigh over 40 pounds. It has scutes along the back half of its body that give support to the tail fin; these give the Cuiu-Cuiu an armored appearance, common in ancient fish.
The red-bellied pacu is related to the flesh-eating piranha, but unlike its notorious cousin it feeds mainly on insects and vegetation. It uses its large, humanlike choppers as a tool for cracking open rubber tree nuts, crushing seeds and chopping up sea herbs and various other food sources.
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