Fig. 22.—Shoulder girdle of Ornithorhynchus. c1, c2, c3, First, second, third ribs; cl, clavicle; e.c, epicoracoid; es′ and es″, interclavicle (episternum); m.c, metacoracoid; m.s, manubrium sterni; sc, scapula; st, sternebra. (From Wiedersheim's Structure of Man.)
Date 1902
Source The Cambridge Natural History, Volume X—Mammalia.
Author Frank E Beddard
Source: https://commons.wikimedia.org/wiki/File:Cambridge_Natural_History_Mammalia_Fig_022.png

The platypus or duck-billed platypus (Ornithorhynchus anatinus) is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania. It is one of the extant species of monotremes, the only mammals that lay eggs instead of giving birth.