african grey: commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa
physical entity: an entity that has physical existence
heparin: a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery