On 6 different Roc colorations there seems to be a problem with the coloring of the talons. It might only be 5, as a4_b4 is a close call. On all of them, the closer foot seems to have darker talons (yes, I realize some of this is shading that discolors the rear foot talons). I didn't notice this on any other species. If this isn't an error and the talons on the following colorations are meant to be different, just disregard!

a5_b4

a5_b5

a4_b4

a2_b2

a2_b3

a2_b4

I suppose that it's obvious that 30 different skins having the same feature were created intentionally and this can't be a bug. Rocs have air perspective effect to show the size. All other species are smaller and do not have this effect.