Just wanted to update that I opened the portal door! I opened it for a few hours yesterday while the big ones were free ranging. So that the chicks could get a feel for the run without anyone else in there. They had a blast with the big run to themselves. Then I practiced me walking in and going toward them to see if they would go back and they did great! Today it's open with the big ones in the run and a couple chicks will venture out at a time and none of the big chickens have even acknowledged them. So it's going great!! You guys are so smart!!