Biological classification
When the present system of naming living things was developed, Latin was the language most widely used around the world. So, such names are still in Latin. Latin is also used presently because it is a dead language, so it never changes. The official descriptions and diagnoses of new taxa in Latin were and are written in Latin as well. Zoologist allow any language for the description of animals. From January 1, 2012, new taxa of algae, fungi and plants may be described in either English or Latin.