Figure 4From: Qualitative skeletal correlates of wing shape in extant birds (Aves: Neoaves) Biplots showing the distribution of bone and wing shape character loadings for the tree sample. drp: dorsal remigial papillae; crp: caudal remigial papillae; dpf: dorsal phalangeal fossae; iip1: presence/absence of internal index process; iip2: shape of internal index process; fp: flexor process digit III; AR: aspect ratio; M: mass.Back to article page