the all tan one is definitly a buff. If the black ones are cuyoga..which i am pretty sure they are..then they're mixed with something else..I see a swedish blue..and possible a fawn runner..not quite sure because i don't see a picture with the duck standing..my runner easily stands 4 inches taller than the others when she's up right...but then that one may also be mixed with another breed so that it has some characteristics of say a buff, or khaki. Nice flock though..they're beautiful
