I have bantam Ameracaunas also.... I was just talking with DD and trying to figure out which hens would make good bantam EEs. I have a tiny little black bantam, she is a Serama mixed with ? but she is muffed, so she is in the running. Plus she is a great little layer & broody. Have her daughter too. And of course I have bunches of Serama, even fizzles. Trying for the tiniest.
I also have very young bantam cuckoo Maran for OEs.
