Order Proboscidea is a taxonomic classification for a mammalian group with a distinct feature- elongated, flexible, muscular trunk-like structure, which is also referred to as a proboscis. These animals are commonly known as elephants, but there are also other forms of Proboscidea that roamed the earth, including Mammoths, Mastodons, and Gomphotheres. While the Order Proboscidea contains several extinct species, it is still home to the two living species of elephants - the African and Asian Elephants. The group name 'Proboscidea' derives from the Greek words 'pros' and 'boskein,' meaning 'before the mouth.' In summary, Order Proboscidea includes all mammals having a long flexible snout or trunk used for various functions including respiration, sensing surroundings, and gathering food.