Four-year-old alex and his mother visited the zoo. while they were there, alex's mother took him to see the squirrel exhibit. alex saw many different types of squirrels, but when he saw a flying squirrel glide from one branch to the next he pointed and said, "a bird." considering piaget's work, alex is demonstrating an example of

The correct answer should be assimilation.
According to the psychological definition, assimilation is when somebody uses the existing knowledge to include something new in it. So, this kid knew what a bird is - he knows that it can fly. So when he saw a flying squirrel, he thought it was a bird, because he didn't know that there are squirrels who can do that. 

It’s actually still in the u.s.