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. Frog's back is green, smooth and soft, with patterns, and its abdomen is white. You can hide it in the grass, which makes it easier to catch pests and protect yourself. Its skin can also help it breathe. Its airbag is only available to male frogs. Frogs hunt with their tongues, which contain mucus.
Frog's head is flat, slightly triangular and its snout is slightly sharp. The mouth is wide and horizontal, and consists of upper and lower jaws. There are 1 external nostril at the front end of the dorsal maxilla, and there are alars at the outer edge of the external nostril. Eyes are large and prominent, born on the left and right sides of the head, with upper and lower eyelids; There is a translucent transient membrane on the inner side of the lower eyelid. What happens to the position of the eyeball when the eyelids are closed? There is a round eardrum behind each eye (toad's eardrum is smaller. There are 1 pairs of oval protrusions in the back and upper part of the eye and tympanic membrane, which are called retroauricular glands. The male frog has a layer of light brown membrane pleats on the inside and back of the corner of his mouth, which is a sound bag and will swell into a bubble when singing.