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Hippos are very big animals.
They live in rivers in Africa.
But now, there are lots of hippos in South America.
The hippos came from a private zoo in Colombia.
Criminal Pablo Escobar owned the zoo.
Police killed Escobar in 1993.
The zoo closed.
The hippos went into the rivers.
They had lots of babies.
Now, there are too many hippos.
This is bad for other animals.
The zoo had four hippos.
Now, there are around 100.
In 10 years, there will be thousands.
Scientists want to kill 30 hippos each year.
South America is a good place for hippos.
No other animals can kill them.
There is a lot of rain too.
It is different from Africa.
Colombian scientists are worried.
The hippos are bad for the environment.
They are very dangerous.
But many people like hippos.
They are angry about the plan to kill them.
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