I love chicken math! I started with 6 black australorp hens a few years ago. The numbers have since grown and shrunk, grown some more, shrunk a bit, then blew up. LOL!
I lumped several into the backyard mix group, mostly because I don't know where to begin on identifying their breed. I have a few guesses, but nothing solid.
Okay, I only have between 1 and 5 of each but I think the list is pretty long.
(Edited because I forgot the ducks and quail.)
Chickens:
1 silkie
2 cream legbar
6 egyptian fayoumi mixes
3 buff orpington
2 road island red
1 cinnamon queen mix
2 barred rock
1 barred rock bantam
1 old english game...