Traffie Chickens
Songster
My thoughts were that the first two are boys and second two are girls. But I just came on here to double check. 
First chick: either cuckoo maran or barred rock.
Second chick: also either cuckoo maran or barred rock.
Third chick: Austra white
Fourth chick: Black Australorp.

First chick: either cuckoo maran or barred rock.
Second chick: also either cuckoo maran or barred rock.
Third chick: Austra white
Fourth chick: Black Australorp.