Secondary wing feathers are the ones closest to the body. Primary wing feathers are like the finger tips of the bird. Hens' secondary feathers will keep together leaving a bit of a gap in between the secondary and primary wing feathers. Roosters' secondary wing feathers spread out, there will be no gap between secondary and primary wing feathers.Can I get a little bit more of a description? I don't know what I am looking for and I don't know how to make them hold still for a photo.