How many are there? Individual side and comb pictures are best. But at 10 weeks, pullets won't have large combs or much wattle development, if any. Are you sure you didn't mean 10 months? These birds look too big for 10 weeks to me.
Tail feathers don't really matter at that age, as Gray Farms said. Also, lavenders often have problems with feathering and you'll see some without tail feathers even when fully mature. I think it's just part of the genetics of that color variety.
Now, from what I can tell from the pictures:
Picture 1- bird on the left is a cockerel.
Picture 2- bird on the left, in the center of the photo is a cockerel.
Picture 3- cockerel
Picture 4- bird in center of photo is a cockerel
Picture 5- if it's really 10 weeks old then this bird is likely a cockerel, too.
My question is, I know combs are a good indication of sex but I’m watching tail development and what I believe to be saddle feather development and I’m trying to make a good guess on what’s what. Their combs seem to be all developing at the same pace but a few have very short tails that are kind of whispy and some their tails are more of an adult hen type. Thoughts?
