Will not appear in China. The reason is that piranha, as a tropical fish, has very strict requirements on water temperature. There are more than 50 species and genera in the world, which are divided into carnivorous and omnivorous, but whether they eat meat or not, they all have sharp teeth in their mouths. Ordinary piranhas are 12- 15 cm long, while pure carnivorous piranhas can reach 50 cm long. Piranha's skull is particularly hard. Although its neck is short, it has a strong bite force and likes to hunt in groups. However, piranha is actually a kind of? Bullying the weak and fearing the hard? Some fish only attack big fish when they are extremely hungry, and usually only attack injured and weak fish. Some small crabs and birds are also in their recipes. Moreover, piranhas are generally of high value, mainly gray-green, and their bellies are brightly colored, especially male piranhas, which are usually brightly colored and beautiful in appearance, while female fish are of average value but larger in size. Some experts have done experiments: an adult sow feeds 500 piranhas, and the result is less than 15 minutes. After that, experts put a bite force measuring instrument in the mouth of piranha, and measured that the bite force of piranha was more than 30 times its own weight. It can be said that under the same weight, they are stronger than great white sharks, and their attack power is definitely the apex of the animal kingdom.