"Typical passerine sternum, pectoral arches, and sternal ends of ribs; from the robin, Turdus migratorius, nat. size; Dr. R.W. Shufeldt, U.S.A. Sternum single-notched, with prominent costal processes and forked manubrium; five ribs reaching sternum, one rib "floating"" Elliot Coues, 1884

Sternum of a Robin

"Typical passerine sternum, pectoral arches, and sternal ends of ribs; from the robin, Turdus migratorius,…