Piranhas
Piranhas are freshwater fish that inhabit the waters of South American lakes and rivers. Known for their razor-sharp teeth, strong jaws, and penchant for feeding frenzies, these fish are considered dangerous to both animals and humans. While most people are under the impression that all piranhas are carnivores, some are actually vegetarian. Most piranhas only grow to about two feet long. The most common type of piranha, the red-bellied species, only grow to about 20 inches in length. Piranhas usually attack during the dry season, when water levels are low and food is scarce. Splashing in the water can cause the piranha to go nuts, and attacks on humans are mostly on the arms and legs.