Pachyderm is a term used to refer to a group of large, thick-skinned animals, including the RHINOCEROS, ELEPHANT, and rhino. These animals are characterized by their thick skin, which helps protect them from predators and the elements. The RHINOCEROS is a large mammal with two horns on its snout, and is the largest of the three pachyderms, with 10 letters in its name. The ELEPHANT is the second largest of the three, with 8 letters in its name, and is known for its long trunk and large ears. The rhino is the smallest of the three, with 5 letters in its name, and is characterized by its single horn. All three of these animals are considered to be pachyderms.