protruding feather germs are sequentially visualized in the dorsal , thigh , breast , head , humoral , ventral , wing , eye , and external auditory meatus feather areas , respectively , from stage 31- to stage 39+ [ v. hamburger and h.l . hamilton ( 1951 ) j. morphol . 88 , 49-92 ] .
C0018670
head
C0015392
eye