Which animal only has a lower set of teeth?

Introduction: Which animal only has a lower set of teeth?

When it comes to dental structures, most animals have a combination of upper and lower teeth. However, there is one unique creature that stands out from the rest – the platypus. This semi-aquatic mammal, native to Australia, is known for its odd appearance, including its flat tail, webbed feet, and most notably, its bill. But what many people may not know is that the platypus only has a lower set of teeth.

The unique dental structure of the platypus

Unlike most mammals, the platypus does not have any visible teeth in its upper jaw. Instead, it has a series of hard, flat plates that it uses to grind up its food. These plates are made of a substance called keratin, which is the same material that makes up human hair and nails. In the platypus’ lower jaw, it has a set of 18 to 22 teeth that are sharp and pointed, perfect for catching and holding onto its prey. These teeth are not rooted in the jawbone but are instead attached by a ligament, allowing them to move independently to grip and tear food.