The long-beaked echidnas make up one of the two genera (Genus Zaglossus) of echidnas, spiny monotremes that lives in New Guinea. There are three living species, and two extinct species in this genus. Echidnas are one of the two types of mammals that lay eggs.
Flannery, T.F. and Groves, C.P. 1998 A revision of the genus Zaglossus (Monotremata, Tachyglossidae), with description of new species and subspecies. Mammalia, 62(3): 367-396