Both zinc phosphide and vacor induced almost similar changes in the haematology ofBandicota bengalensis andTatera indica. Lymphocytes decline and an increase was seen in the counts of red blood cells (RBC) and neutrophils, bleeding and clotting times. Per cent weight loss was more in zinc phosphide poisonedB. bengalensis. The variations exhibited by the two species and sexes indicate gerbils, particularly females as most resistant and female lesser bandicoots to be the most susceptible to the poisons tested.