根据短文内容选择正确答案。
Miss Liu: Come on, Children! Let's go to the Water Zoo by school bus.
Children: Great!
(In the Water Zoo)
Miss Liu: Look! This is a bear. What colour is it?
Gao Wei: Wow! It's so big. It's brown. It has small ears.
Li Yan: That's an elephant. It has a short tail (尾巴)and big ears. It's big, too.
Peter: Look at the monkeys! They are in the tree (树). They have long tails.
Gao Wei: And some are eating apples. What lovely monkeys!
Miss Liu: Boys and girls, what's that? It's yellow. It has short legs and a short tail. It can swim.
Can you guess?
Children: Uh…?
Miss Liu: Let's go and find it on the river(河).