so i was thinking what if nichelings with around 4+ digging can dig burrows to protect baby nichelings from the blue bird and maby add a bit of camouflage. the burrrow takes 5 nesting material to build and will collapse after 7 *days and the nicheling inside will have to be dug out. every day the nicheling is inside the collapesed burrow they will take 1 day of damage, after 5 *days the burrow will begin to fall apart and you can fix it by using 2 nesting material.   Edit: I changed tu