Six-month-old hippopotamus is the star of the show at Vandalur zoo / Baby pandas make their big zoo debut / Zoo that painted dogs to look like pandas shows 'tigers' with everyone saying same thing / Melbourne zoo welcomes rare southern white rhino calf to the world / Australian zoos target roaring trade through luxury lodges and glamping / Kids watch in shock as bear devours ducklings, one by one, at Seattle zoo / Can a 'Muslim' lion, 'Hindu' lioness live together? An Indian zoo dilemma / Zoo animals beat the heat with icy treats in Perth / After all of this time searching for aliens, are we stuck with the zoo hypothesis? / Golden retriever nurses African painted dogs at zoo