wing feathers

[mxpres]

I read somewhere that you could tell a young hen from a rooster by the wingtip feathers,could someone explain in more detail about this?thanks

 

[mamaKate]

I hope someone has more details. I know it only works for certain breeds and it has to do with the evenness ( I think) of the feathers.
ETA: Try a search for "feather sexing."