In the video, a person wearing blue gloves is seen cleaning a hippopotamus's face with a green towel. The hippopotamus is lying down and appears to be enjoying the cleaning, as it opens its mouth wide and allows the person to clean its teeth. The person uses the towel to gently wipe the hippopotamus's face, focusing on the mouth area. The hippopotamus's skin is dark gray, and it has small hairs on its face. The person's movements are gentle and careful, ensuring not to cause any discomfort to the animal.