Panthera tigris altaica The facial markings as well as body stripes of tigers are unique to each individual and can be used for identification purposes. Siberian tigers Alexis (l) and Norma (r) reside at the Bronx Zoo in NYC. Siberian Tigers are the largest and heaviest subspecies. Females can measure up to 8 1/2â€™ and weigh 370 lbs. Acrylic on paper.