The 6-meter-large fish in the Amazon River is covered with the toughest fish scales

Most of the most dangerous freshwater creatures in the world live in the Amazon River, where freshwater fish and reptiles In the arena, they have become a state of "you are stronger and I am stronger" in the long-term co-evolution.

For example, arapaima and piranha, in the Amazon River, they are like "spear and shield".

Piranhas often hunt in groups and are famous for eating their prey down to the bones. Due to their special mouth muscle structure, piranhas have the largest bite force among animals of the same weight.

Arapaima and piranhas live in the same waters. In order to resist the bite of piranhas, they have evolved tough fish scales. These fish scales have been proven to be the toughest flexible material in nature.

In fact, with this "armor", arapaima not only are not afraid of piranha bites, they will also eat piranhas when they get the chance.

Although arapaima will prey on scary piranhas, this fish is not scary at all. On the contrary, their strange breathing methods often attract humans to hunt them, a bit like the "Iron Hanhan" in the Amazon River. .