If we don't need the birds' eggs, as they used to, why do we send a mother bird away from her own eggs just to fulfill the mitzvah of Sheluach HaKan? Would the mitzvah even apply if we are doing it ...
A number of reasons are given for sending away the mother bird before taking her eggs/young. The Rambam says it is for the mercy on the mother bird. The Ramban says it is to perfect our own mercy. ...