The rhinoceros has thick gray skin and a horn on its snout.
pig
lesser mouse-deer
Keratin
Depends on the species. Carnivores will bite, big herbivores often have horns, or can kick.
The white tailed deer is the only animal that sheds their horns each year. This makes the size of the horns of some specimens remarkable, because they have grown in one season.
They can have horns
Horns.
narwhals have horns
horns
yes they do have horns
Horns of a Dilemma
No snakes have horns.