Shellfish: Even my tough shell can't escape the predation of the piranha, it's so fierce.
Throughout history, we've always thought of fish as being stupid, believing fish species to be simple-minded and lacking intelligence.
It was even rumored that fish have only a 7-second memory, forgetting everything after 7 seconds – this is just a rumor.
Although fish have smaller brains and smaller brain capacity, fish have existed on Earth for a much longer period compared to humans.
If fish were stupid and didn't know anything, they would have been eliminated long ago.
Fish not only have memory and intelligence, but also strong learning and imitation abilities.
Some fish species can even use simple tools or catch their favorite food when hunting.

For example, 'Piranha,' Piranha is a fish species mainly distributed in South Asia.
It belongs to the Perciformes and the Piranha family. Just hearing this name, you can imagine it has teeth, and these teeth are not small, otherwise why is it called Piranha?
This is the entire appearance of the Piranha, a plump body, long and prominent teeth, looks quite fierce. This fish is indeed very fierce and vigorous.
Piranhas typically live in coral reefs, and their food consists of shellfish. How do fish eat such hard shellfish?

This starts with how they find food. There are various shellfish on the bottom of the coral reefs, but it's not easy to eat them.
When they can't reach certain shellfish, they will use their 4 teeth to move the coral covering the shellfish, thus capturing the food.

The shells are very hard, and it's impossible to bite them open directly, so they can only smash them open with stones. Piranhas bite at shellfish and then forcefully hit them with stones, one, two, … until the shellfish are smashed open, and then they can enjoy the food. Such operations by Piranha are not isolated cases, but the entire Piranha family does this! Shellfish are their main food source.
In fact, all fish species are intelligent, just with different levels of intelligence. Even the same fish species can have different intelligence levels depending on their environment.
Wild fish versus farmed fish have a bigger difference. Farmed fish have no worries and only eat, and their intelligence won't improve.
Wild fish work and adapt to their environment every day, and their intelligence becomes higher and higher.
What are your thoughts after watching the Piranha's hunting method? How high do you think its IQ is? Light just thinks that the IQ of fish is at least over 80. Below is an IQ table.
70-low intelligence, 70-89-low intelligence, 90-99-medium intelligence, 100-109-high intelligence, 110-119-outstanding intelligence, 120-129-extremely high intelligence, 130-139-extremely extremely high intelligence, 140+ genius