"Prototheria" Natural Recordings by Native Speakers
Prototheria is a clade of mammals, which includes the monotremes (such as the platypus and echidna), characterized by laying eggs instead of giving birth to live young. The name "Prototheria" comes from the Greek words "proto", meaning "first" and "therion", meaning "beast" or "animal", indicating that this group is thought to be the earliest known lineage of mammals.