阅读对话，完成下列题目。

Teacher: Let's go to the zoo!

Children: Great!

Teacher: Look at the birds! How many birds do you see?

Children: 1, 2. . . We see 13.

Teacher: Come here, children! How many fish do you see?

Children: 1, 2. . . We see 20.

Teacher: Amy, how many giraffes do you see?

Amy: I see 15.

Mike: Wow! Look at the monkeys!

Amy: How many monkeys do you see?

Mike: I see 17.

Amy: 17? No, the brown one is a bear!

Children: Ha ha!