The largest of these three bird pendants is of the type that Jessica Rawson describes as becoming more widespread in the Western Zhou period. See, J. Rawson, Chinese Jades from the Neolithic to the Qing, British Museum, 1995, p. 227, fig. 1. The author goes on to note that during this period the tail became more horizontal and looks more like a 'fish' tail, which is true of the present pendant. The small bird with the compact body and long crest shares similarities to another illustrated by A. Salmony, Archaic Chinese Jades from the Edward and Louise B. Sonnenschein Collection, The Art Institute of Chicago, 1952, pl. XLIX (5). The most unusual of the three is the bird with small raised head and upturned tail partially detailed in thread relief, a style of carving more often seen in jades of late Shang date.