I want to believe that feeding 1 large is better than multiples of smaller, but I recently read that in the wild BPs will raid a nest and thus kill and eat multiple rodents at once... so maybe it isn't so bad to feed multiples.

I have one BP who will take rats and one who refuses... We are raising our own mice for the one BP and our corns, but I buy our rats frozen from the mouse factory and am very pleased with them!