There are many kinds of ants in America.One kind of ants is very strong.People are afraid of them and the other animals are afraid of them,too. These ants are often in big groups .They eat all the animals on their way.They can kill and eat elephants.And they can eat horses,too.Sometimes they can even kill people and eat them.When the ants come near,people leave their homes.But people are sometimes happy after the ants pass by.Because they can see no insects  or snakes. People are afraid of the ants because   _  .
they can eat and kill elephants they can eat horses they are often in big groups they can kill people