Piranha

Piranha fishes are known for their sharp tooth, and often described as extremely predatory fish. They have strong biting abilities, especially the black piranha; relative to body mass, they produce one of the most forceful bites measured invertebrates. Due to the climate change on earth, piranha's natural enemies will grow bigger. So, they will evolve black and green camouflage. No matter which direction you look, they will blend in with the environment. Piranha fish will also grow bigger and harder fish scales to protect them from attacks. Not just their enemies, their prey will change too. Thus, to spot their prey faster, they have much bigger eyes than their ancestor. They also grow larger teeth and stronger jaw to tear flesh.