Chennai, Apr 12 (ANI): The birth of a bison calf at the Vandalur zoo here is attracting scores of visitors to marvel at the new arrival. With the birth of an unnamed calf on Wednesday the bison population in the city's Aringnar Anna Zoological Park or Vandalur Zoo has gone up to six. Zoo officials said the calf's mother, Geeta, was brought to the zoo after being rescued by forest ...