The history behind scientific naming is simple and logical. In order to share information and prevent confusion, scientists from around the world use a universal method of identifying animals. The first rules for assigning scientific names were established in the 1700s. Since that time, they have been refined into an international code. Scientists follow the guidelines when naming newly discovered creatures. Each name must uniquely identify the animal and be easy to pronounce. Latinized words with grammatically correct Latin spellings are preferred. Once names are assigned, they can never be changed by individuals. Since 1930, an explanation of the name's meaning has been required.