Table 1.

Estimated LCE among Avian Skin Appendages

	Feather	Scutate Scale	Reticulate Scale	Claw
Feather	1	0.88	0.79	0.71
Scutate Scale		1	0.86	0.72
Reticulate Scale			1	0.71
Claw				1

Note.—Estimates were obtained from transcriptomes of early skin appendage development (placodes) in chicken and emu embryos. For each skin appendage type in each species, we averaged gene expression across replicates, and calculated $\widehat{\gamma }$ using gene expression contrasts <10 to avoid the influence of highly expressed structural genes.