Given 3 hens (?), wasn't told their breed

[The Moonshiner]

We’ve all been there on the giving and receiving end of unsolicited chicken advice lol. Whatever you do don’t bring up ventilation

Sorry you haven’t gotten an answer about the breeds. If you can get individual full-body pictures of each bird that might help. Leg color can help with identification.

Pretty hard to ID black chickens with confidence without a breed specific trait.