Langshan #1: Wing test
This one's feathers were hard to make out - there appeared to be short feathers nestled between the long ones, but it was hard to say for sure. This one could go either way based on the wing test.
Langshan #1: Wing & tail feather development
Hard to say - definitely has wing feathers, but they are small. Has a prickly butt where new feathers are coming in under the fluff. This one is more pullet-like than the blue cochin but could be a roo too based on these tests.
Langshan #2: Wing test
A bit blurry, but this one has a short-long pattern (pullet).
Langshan #2: Wing & tail feather development
Pretty much like #1 in terms of wing and tail feathers.
It's hard to say what these two are. The wing test says number 2 is a pullet, but we couldn't tell with number 1.
Overall, for all 13 chicks, the tests say that one of the blue cochins is a cockerel, and possibly one of the black langshans, and that the rest are pullets. The odds of only 1 of 13 being a cockerel is 1 in more than 220,000,000 so highly unlikely. If it turns out to be true, I'm running to buy a lottery ticket!