can you tell the difference at ten weeks?

[earlybird10842]

Is there noticeable differences between pullets and cockrels at ten weeks of age? All of mine are the same in size and leg thickness--even though one's a banty. All of them also have a bump on the backside of their leg--put three of the four are sexed as pullets.

 

[Roosterlover5]

Im not sure if you can tell at ten weeks of age...but as they get older roosters have pointier feathers for hackles and there tail feathers are drooped more. Can you post pics?