I have six female rats I rescued from a local rescue. They live in a four critter nation cage (two double critter nations connected) I spend time with them every single day. I can hand feed them treats however they will not come out of the cage. I don’t want to force them but I also want to continue the bonding process since I have had them close to two months now and I know being in the cage constantly is not ideal for them. How do I encourage development without making anyone more nervous?