My roosters tail feather aren't growing!

[kwharton]

My rooster is 4months old and his tail feathers are as short as the hens. My other roosters who are the same age have very long tail feathers. Do some roosters just have short tail feather? Or could they grow out as he ages?

 

[kwharton]

 

[aart]

Does he in fact have a tail?
Some birds don't have the actual appendage and are called rumpless.