The external anatomy of a frog includes the following. The head of a frog is triangular in shape and contains the brain, eyes, ears, nostrils, and mouth. The frog has two large, bulging eyes on the top of its head. Each eye is protected by a transparent eyelid. The frog has two round, flat ears located behind its eyes. These ears are not visible from the outside. The frog has two nostrils on the top of its snout that allow it to breathe air. The frog's mouth is wide and is located at the front of its head. It is lined with small teeth that are used to hold and crush prey. The frog's skin is smooth, moist, and slimy. It helps the frog stay hydrated and protects it from predators. The frog has four limbs that are used for movement. The front limbs are shorter and have four digits, while the hind limbs are longer and have five digits. The frog's hind feet are webbed, which helps it swim and jump through water.
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