Have you ever seen a hippo get its teeth brushed? This video from CGTN Español shows how a zookeeper cleans the teeth of a very cooperative hippo. The friendly hippo keeps its massive mouth open for ...

Hippos are large, semi-aquatic mammals with a barrel-shaped body, short legs, and a large head. They have gray or brownish-gray skin, with pinkish areas around their eyes, mouth, and ears. Hippos are ...