LOL, too funny. My almost 4 month old Serama chick from Cara (SunValleySeramas) is about the same size as my 4 week old Australorps!
I hatched 7 OEGB's and 3 Seramas all at the same time, and they've been in the brooder together. They are all 3 weeks old this weekend. Its so interesting and fun to see the differences. Both breeds are quite small. The OEGBs have really taken to the jungle gym roosts I made, while the Seramas prefer to be on ground level. I have one Serama chick that is much smaller than the rest, and capitalizes on his/her size to dart in and out from under the other chicks' legs.