Enemies in Final Fantasy XI are officially divided into broad categories known as Types. Most monster Types have correlation with other Types. Families of monsters within one Type are able to intimidate monsters from the Type that they are strong against. For example, Beasts are the natural predators of Lizards and will be able to intimidate them. Variations of monsters within each family are known as Species, which are typically differentiated by slight differences in their appearance or the special abilities they use.