Lemuriformes is a taxonomic infraorder of primates, also known as lemurs. There are several synonyms for this word, including Prosimii, which was previously used to refer to all primitive primates. Other synonyms include the terms Strepsirrhini and Lorisiformes, which are used in some classification systems to describe the same group of animals. These lemurs are characterized by their nocturnal habits, elongated fingers, and long snouts, which help them to locate insects and other small prey in the dark. They are found only on the island of Madagascar and nearby smaller islands, where they have evolved into a diverse array of species with unique ecological roles.