The riddle literally means to describe a frog.

Frog body can be divided into three parts: head, trunk and limbs. Frog has four toes on its front foot, five toes on its back foot and webbed feet. There are two slightly bulging bags on both sides of frog's head. That's its eardrum. Frogs can hear sounds through it.

Extended data

The smallest frog is only 5 cm, which is equivalent to the length of a human thumb. The biggest frog is 30 cm (more than a foot long), short and wide, with strong hind legs. The pupil is horizontal, the skin is smooth, the tip of the tongue is divided into two forks, and the tongue goes back to the mouth along the front of the mouth, which can suddenly dig out and catch insects. There are three eyelids, one of which is transparent.

For eye protection in water, the other two upper and lower eyelids are more common. There are two sound sacs on both sides of the head, which can produce * * * and amplify sound. Smaller varieties have higher frequency of calls.