Right now I'm not sure on breed, maybe in a couple of weeks when they have a better feather pattern. It is also to young to sex for sure but 1 and 2 look like cockerels, is the last picture a different chick?
Where did they come from (hatchery or breeder) and how old are they? My first thought is they're barnyard mix with some barred ancestry. 1 and 4 pics may be cockerels, but not positive.
These chicks I got from a livestock auction. No idea where they came from. I got them when they were maybe 4 days old. Right now I would say they are a month and a half old.
I learned about auctions when you are buying. I learned they sell unwanted roosters and old laying hens.I was pretty bummed out at first when I found out most of my chickens are cockerials. I had no knowledge about chickens. I'm young and wanted to start my flock and 75 percent are roosters.