Cf. a very similar figure of a bird with comparable treatment of the tiered feathers in the Arthur Sackler Collection, Washington D.C., Catalogue, p. 96, no. 52; and another in the Fogg Art Museum, illustrated by M. Loehr, Ancient Chinese Jades, Cambridge, 1975, p. 188, no. 247.
Compare also a bird-shaped pendant in the Capital Museum, Beijing which is attributed to the Shang dyansty, again similarly carved with tiered feathers and elongated tail, illustrated in Gems of Cultural Relics Series, Jades, Beijing, 2002, p. 50, no. 18.