Hippos in Russia
Hippos are aggressive, easily scared and very dangerous animals. People can use them for fighting. In Russia, however, they do tricks at a circus show.
One circus has three hippos. They roll over, jump, and even play a real-life version of Hungry Hippos. Sometimes, they get close to people, but they are not afraid.
The hippos are fully trained. No physical force is used on them.
Difficult words: aggressive (somebody who often fights is aggressive), roll (turn over and over), physical force (hurting someone to make him or her do what you want).
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