What bcr229 said also. Try to limit the prey items to two different items. But definitely space out the offerings to 2 or 3 weeks. Maybe offer a chick or quail? Don't brb's enjoy a occaisional bird in their diet? Aren't birds a more natural prey? Idk.
I've never tried mine on chicks or quail but since they are semi-arboreal it wouldn't surprise me.
Mine will go for rabbit kits (for juvenile BRB's) and fuzzies (for adult BRB's) very enthusiastically.