Figure 2

Hard and soft skin appendages in birds/chicken. On the left panel, soft skin appendages including comb, eyelids, maxillary rictus, earlobes and wattles are shown. On the right panel, hard skin appendages including beak, feathers, feather follicles and chicken legs skin are shown with a special focus onto legs scales. Legs possess different hard cornified elements: claw, scutate scales (large and distally overlapping scales) onto digits and anterior face of the shank, scutella scales (smaller and proximally overlapping scales) on the posterior face of the shank and finally reticulate scales (smaller) that recover the remainder of foot surface and are non-overlapping. This figure was illustrated by using BioRender.com (Agreement number: GC26L9TWNH) and Inkscape software.