Witness - Drugged to death

A look at why India's vulture population is declining alarmingly. Committing oneself to saving vultures may not be everyone's idea of a life vocation. But for 33-year-old Arnab Basu, based India's state of Assam, it is a serious mission with global health ramifications. Over the last 10 years, the population of vultures in India and Pakistan has reduced by 95 per cent - they are now at risk of extinction.