No.4 This is a very small animal. It has a green body,but its belly（肚子）is often white. It has four legs .Two of them are long and two of them are short. It has two bigs eyes .It can often make a loud sound(声音) in the evening or at night in summer. It is a good high-jump player（跳高运动员）. It likes to eat bad insects（坏虫） in the field . It is a excellent（出色的） helper of farmers.It often lives in the field.What is it ?----It's a frog.