The only "real" Sumatra's are the large foul. A large foul rooster will weigh about 5 lbs max. A large foul hen about 4 lbs. Much smaller than my RIR's. The RIR hens are bigger body wise than the Sumatra roosters. The roosters make up for it in feathers.This is why I keep getting this breed confused...I've seen it spelled so many ways. The other day I came across someone mentioning Samuntras?! And then someone mentioned how small your birds were, Stony. I thought they were pretty average sized? ARE they small? I had no idea.
Now the bantam Sumatra's are a human made monstrosity that never should have happened imho. Don't mess with mother nature.
There are similar names chickens that are NOT Sumatra's but people confuse them with Sumatra's. For instance Serama. NOT a Sumatra. But people get confused easily.