animal husbandry costs are nowhere near $10 per mouse per day, either that number is wrong or it is including all sorts of ancillary costs I understand the national average per diem for mouse care is $0.98 and reflects direct costs. You are right that if other indirect costs were loaded in, the per diem would be much higher. A recent mouse housing building in Manhattan cost $1,000 per sq ft to build. Try adding that to the cost of housing mice. :-) ij