Parsis, a religious minority group living in Mumbai, India, are facing a crisis. The group is suffering declining numbers worldwide: there are an estimated 130,000 left in the world, 43,000 of whom live in Mumbai. And now an important part of their religious faith is being questioned – the way they dispose of their dead. Their age-old tradition calls for corpses to be left as carrion for vultures. In Mumbai, corpses are brought to the Towers of Silence, but today they are left to rot as the vulture population on the subcontinent has been in decline for years. In Mumbai, vultures are virtually extinct, which means that the Parsi corpses are taking months to decompose as they are left out to the elements. Read more about the controversy at the BBC.