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The Pacu Fish
You probably don’t need much explanation as to why the residents of Papua New Guinea call this fish a “ball cutter.” The local fishermen were really worried about the safety of their testicles when they had to get in the water! (Image credits: imgur |evolvingcomplexityii)
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Giant Isopod
This one is the largest of the existing isopods. “The enormous size of the giant isopod is a result of a phenomenon known as deep sea gigantism. This is the tendency of deep sea crustaceans and other animals to grow to a much larger size than similar species in shallower waters.” (Image credits: Littoraria)